Quantity of angular motion possessed by a body measured as the product of moment of inertia and angular velocity 2 See answers Advertisement Lanuel The amount of force the football player must apply to the sled is 176.4 Newton. A farmer pulls the leash of a stubborn, 200 kg pig -e = [(v2post - v1post)/(v2pre - v1pre)], Impact between a moving body and a stationary one A Suppose you place a block of mass M on a plane inclined at an angle . F = 20 N 3. The coefficient, Q:3. The 140 g ball has about, A:Given - Angle of the incline = 36.87o, Q:Q4: Two boxes with masses m, and m; are placed on a frictionless horizontal surface and pulled How much force must he apply to the sled? The coefficient of kinetic friction between the grass and the sled is 0.30. horizontal., Q:3. What is the tension Ch. ---When the line of action of a body's weight (directed form the CG) moves outside the base of support, a torque is created that tends to cause angular motion of the body, thereby disrupting stability, with the CG falling toward the ground. d = force's moment arm, shortest (perpendicular) distance between a force's line of action and an axis of rotation (joint). the sled is 0.30. The coefficient of kinetic friction between the grass and the sled is 0.30.Part AHow much force must he apply to the sled?ANSWER:Problem 9Zach, whose mass is 73 kg, is in an elevator descending at 12 m/s . 18 N B. A. d = displacement of an object along the line of action of the force. Impulse | Physics Quiz - Quizizz The moment of inertia (I) represents an objects resistance to angular change about some axis William Moebs, Samuel J. Ling, Jeff Sanny. How much force must he apply to the sled?A. 18 N B. Math Homework Questions and Correct formulas. The figure shows the overhead views of four situations in which forces act on a, A:Q7. A motorcycle and rider have a total mass equal to 300 kg. 5 - The forces in Figure P5.10 are acting on a 2.0 kg Ch. (c) Assume that the upper block does not slip on the lower block, and find the acceleration of each block in terms of m and F. Figure P4.68. What must aybe, Q:1. a) A boat moves through the water with two forces acting on it. The traffic light hangs from the cables as shown. 5 - A 1000 kg car pushes a 2000 kg truck that has a Ch. A box rests on the back of a truck. (a) When the truck accelerates forward, what force accelerates the box? (a) If the crate doesnt move, whats the magnitude of the static friction force? at the angle shown. A force of 45 Newtons is required to start a 5.0 kg box moving across a horizontal. -The greater the amount of friction is between an object and the surface or surfaces it contacts, the greater is the force requirement for initiating or maintaining motion. s = 0.65 m 0.38 m 11. -Angular momentum remains constant in the air. The mass of the baseball is 145 g (.145 kg). The engines in a supertanker carrying crude oil produce a net force of 20,000,000 N on the ship. A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. the acceleration. Q:C8. 18 N B. hb = height to which ball bounces The coefficient of kinetic friction between the grass and the sled is .30.How much force must he apply to the sled? Get free access to expert answers Get 3 free question credits Draw a free-body diagram of the dress. (b) Identify the horizontal force that causes the block of mass m to accelerate. first class: lever positioned with the applied force and the resistance on opposite sides of the axis of rotation (ex: seesaw; scissors) Start your trial now! If the vehicle is accelerating at, A:Write down the given values using suitable variables. What is the net force on the motorcycle? -remaining force changes the objects' directions, Perfectly elastic: no energy lost. Group Practice Problem: The coefficient of dynamic friction between the grass and a The box moves up at a, Q:(II) (a) A box sits at rest on a rough 33 inclined plane.Draw the free-body diagram, showing all, Q:Suppose a 60.0 Kg gymnast climbs a rope. Get 5 free video unlocks on our app with code GOMOBILE, foothall player at prartice pushes 200 pound blocking sled across the field constanr speeo Howmuch force must he apply to the sled? Product of muscle tension and muscle moment arm produces a torque at the joint crossed by the muscle, Muscles develop tension-->pulling on bones to support or move a resistance, moment arm (force) / moment arm (resistance) A ball is dropped from a height of 2 m onto the floor. The coefficient of static friction between sled and grass is 0.73, and the coefficient of kinetic friction between sled and grass is 0.68. How much force must be produced by the biceps brachii at a perpendicular distance of 3 cm from the axis of rotation at the elbow to support a weight of 200 N at a perpendicular distance of 25 cm from the elbow? Mathematical Methods in the Physical Sciences, David Halliday, Jearl Walker, Robert Resnick, Alan Giambattista, Betty Richardson, Robert Richardson. 588 N Generally the force that must be applied to the sled is equal to the frictional force experienced by the sled which is mathematically represented as, This site is using cookies under cookie policy . A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s. Calculate the impulse on the ball. air. Mass of sled First week only $4.99! Answered: Friction Group Practice Problem: The | bartleby A car with a mass of 1000.0 kg accelerates from 0 to 90.0 km/h in 10.0 s. (a) What is its acceleration? A 20.O-g ball hangs from the roof of a freight car by a string. Balanced OR Unbalanced Force applied (F) = 4200 N, Q:2) Now, a third block is added between blocks A and B as shown below. 5 - A light block of mass m and a heavy block of mass Ch. 5 - Eric has a mass of 60 kg. Suppose Kevin, a 60.0-kg gymnast, climbs a rope. Displacement of the object along the line of action of the force during the time the force acts on the object. How much force must he apply to the sled?A. If a 100 kg footbalil player only pushes horizontally Question: A football player at practice pushes a 70 kg blocking sled across the field at a constant speed. 5 - Seat belts and air bags save lives by reducing the Ch. Multiply F by the coefficient of kinetic friction between the player and the sled to get the force required to push the sled across the field. This job requires lifting up to 100 pounds and dealing with dangerous animals. 5 - A 500 kg piano is being lowered into position by a Ch. since its constant speed , so applied force = friction forceFapp = F frictionF app = N ;F = . Two football players are pushing 60 kg blocking sled across the field at a constant speed of 2.0 m/s. 5 - A 22-cm-diameter bowling ball has a terminal speed Ch. H1 = H2 The distance, Q:6) A box of 4Kg sits on a table. Solved 31. | A football player at practice pushes a 60 kg - Chegg mass of car M = 1000 kg, Q:While digging a small hole prior to planting a tree, a homeowner encounters rocks. shot with a force, Q:When you learn to drive, you discover that you need to let up slightly on the break pedal as you, A:Static friction is a frictional force that resists the motion of an object trying to move from a, Q:Q6: Determine the magnitude of the friction Do wide-track tires = better traction over normal width tires? A students backpack, full of textbooks, is hung from a spring scale attached to the ceiling of an elevator. final speed of ball ,, Q:3. Chapter 5, Problem 29MCQ | bartleby Mass of the airplane, m = 9000 kg What factors influence u (the coefficient of friction)? Once they stop pushing; how far will the sled slide before coming to rest? For considering the, Q:1. How much force must he apply to the sled? A football player at practice pushes a 60 kg blocking sled a - Quizlet along flat, snow-covered ground. Two blocks, A of mass 10 kg and B of mass 30 kg, are side by side and in contact -The higher the position of the CG, the greater the potentially disruptive torque created if the body undergoes an angular displacement. I = mr2 of 25 N. 0.875. a=Fforward-Fresistivem=1950N-1200N1100kg=0.6818ms2 Question: 31. to accelerate a 900-kg rocket How much force must he apply to the sled? (b) What does the scale read if the elevator moves upward while speeding up at a rate 3.8m/s2 ? 60 N C. 180 N D. 600 N force acting over the area of contact between two surfaces in the direction opposite that of motion or motion tendency, maximum amount of friction that can be generated between two static surfaces (F = uR), constant-magnitude friction generated between two surfaces in contact during motion. Determine the lift force exerted on the plane by, A:Given data: 1. relative roughness and hardness of the surfaces. EX: while standing or sitting on a swiveling chair (rotate your upper body in 1 direction -> chair + lower body rotate in the opposite direction) A football player at practice pushes a 60 kg blocking sled across the field at a constant . The relative angle present at the joint is close to the angles of attachment of the elbow flexors. Find Experts are tested by Chegg as specialists in their subject area. N as, Q:5. A. Feedback 5 - A kangaroo carries her 0.51 kg baby in her pouch Ch. When you push a box along the hoor with a force of 7 N. the bo moves at, Q:Freaks yon. (b) What is the minimum possible value of the coefficient of static friction between the crate and the floor? 18 N B. Force? How much work did the discus thrower do to the discus? 5 - Suppose you are holding a box in front of you and Ch. What force is needed to, A:The force required to accelerate the sled is given by High School answered expert verified A football player at practice pushes a 80 kg blocking sled across the field at a constant speed. You'll get a detailed solution from a subject matter expert that helps you learn core concepts. The coefficient of kinetic friction between the grass and the sled is 0.30. The max mechanical advantages for the brachialis, biceps, and brachioradialis occur between angles at the elbow of approximately 75-90 degrees. Its passenger has a mass of, Q:Q1/ A man of mass 75 kg ,and woman of mass 55 kg stand facing each other on The elevator takes 4.0 s to brake to a stop at the first. a) What force does the earth exert on the box? I = mk2 Acceleration (a) = -30 m/s2, Q:A car of mass 1600 kg begins to roll down a hill which is inclined at 15 degrees from the ground., Q:You push a box with a force of 200 N. It slides with a constant velocity across the floor. The coefficient of kinetic friction between the grass and the sled is 0.30. 5 - The three ropes in Figure P5.2 are tied to a Ch. 0.11 m | A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. TO QUALIFICATIONS: Candidate must have excellent equipment, computer, and management skills. 5 - Running on a treadmill is slightly easier than Ch. 5 - Researchers often use force plates to measure the Ch. Status. A marble is placed in a graduated cylinder, which was filled to the 20 mL mark. How much force must he apply to the sled? We dont have your requested question, but here is a suggested video that might help. Candidates will also be on-call at times. As a baseball is being caught, its speed goes from 30 to 0 m/s in about 0.005 s. Its mass is 0.145 kg. We reviewed their content and use your feedback to keep the quality high. Final Exam - Biomechanics Flashcards | Quizlet Forces of 7.6N at 38 degrees and 11.8N at 143 degrees act at a point.Calculate the magnitude and direction of their resultant. vehicle and accelerates at a rate, A:The mass of the trailer ismt=700kg a., Q:A 12.23 kg box made of rubber is on dry asphalt at rest. Candidates will respond to different assignments while upholding the best animal control services in the county. force acting during impact has 2 effects: 5 - An impala is an African antelope capable of a Ch. You can Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. 20 N v = velocity. When the elevator is accelerating downward at 3.8m/s2 , the scale reads 60 N. (a) What Is the mass of the backpack? mass of block , m = 2.0 kg You'll get a detailed solution from a subject matter expert that helps you learn core concepts. When she increases the, Q:A 2.0-kg block is on a perfectly smooth ramp that makes an angle of 30 with the horizontal. 0.30,and 1 6-22 Paunt 5 - A wood block, after being given a starting push, Ch. Part A 60 N Kf C. 180 N | 60kg D. 600 N Disti Show transcribed image text Expert Answer Dear Laluate 200 N Q:A horizontal force, F1, and a force F2 acting at an angle of e to the horizontal, (a) What Is the tension in the rope if he climbs at a constant speed? One is a 2000N forward push, Q:A boat moves through the water with two forces acting on it. 5 - An astronauts weight on earth is 800 N. What is Ch. 5 - Zach, whose mass is 80 kg, is in an elevator Ch. vo = 13.4 m/s (130 mi/h) 5 - A 1.0 kg wood block is pressed against a vertical Ch. -yes, because of the more weight, width doesn't matter a. The coefficient of kinetic friction between the grass and the sled is 0.30. defensive back vs wide receiver in football, when one body exerts a force on a second, the second body exerts a reaction force that is = in magnitude and opposite in direction of the first body 97% of Numerade students report better grades. C.600 N Describe the moment arm during bicep curl? Where would an osprey MOST likely live? A football player at practice The coefficient of kinetic friction between the grass and constant speed. 5 - A construction crew would like to support a 1000 Ch. A mechanical advantage of less than 1.0 is a disadvantage in the common sense of the term. P = power 5 - A person with compromised pinch strength in his Ch. Fnet = net, Q:FRICTION -offensive lineman will not move unless force is applied Once they stop pushing; how far will the sled slide before coming to rest? (b) What is the tension in the rope if he accelerates upward at a rate of 1.50m/s2 ? Explicitly show how you follow the steps in the Problem-Solving Strategy for Newton's laws of motion. -Combination of force and velocity determines power output What is the relationship between the center of pressure and base of support? A. AGARWAL-PHY-166 A:Mass of person = m = 58 kg If the force of friction including air resistance is 250 N and the acceleration of the car is 1.80 m/s2, what is the mass of the car plus its occupants? A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. with, A:Given: A football player at practice pushes a 60 kg blocking sled across the A football player at practice pushes a 60kg blocking sled across the field at a constant speed. N3 1. 18 N B. When the freight car begins to move, the string makes an angle of 35.0with the vertical. -energy absorbed and lost through deformation A. 5 - A 50 kg box hangs from a rope. Linear momentum: quantity of motion, measured as the product of a body's mass and its velocity. a. What mass would a ball need to have if it is thrown at 34 m/s and stops a 78 kg person moving at 3 m/s when they catch it? 5 - It takes the elevator in a skyscraper 4.0 s to Ch. Full time. (a) What is the acceleration of the freight car? If the Ch. Explicitly show how you follow the steps in the Problem-Solving Strategy for Newton's laws of motion. 5 - A woman has a mass of 55.0 kg. This, Q:A boat moves through the water with two horizontal forces acting on it. negligible mass. For most people, a systolic pressure less than 90 mm Hg is considered low. Situation *Response times may vary by subject and question complexity. A constant force of magnitude F is applied to the first block as in Figure P4.68. The figure below represents a cart viewed from above being pulled by two children Limbs move in the direction opposite the applied force - Eccentric muscle action (negative work) 5 - Two blocks on a frictionless table, A and B, are Ch. A Ch. 1,5 m. Enter your parent or guardians email address: Whoops, there might be a typo in your email. The object slow down with an acceleration of -5 m/s2. hd = height from which ball is dropped Lloyds mirror provides one way of obtaining a double-slit interference pattern from a single source so the lig 9.39 The flywheel of a gasoline engine is required to give up 500 J of kinetic energy while its angular velocit For a solid, we also define the linear thermal expansion coefficient, a, as the fractional increase in length p Write each number in scientific notation. As the spring is stretched,, Q:A 60-kg crash test dummy moving at 13.4 m/s (130 mi/h) stops during a collision over a distance 5 - An astronaut takes his bathroom scale to the moon Ch. C. Acceleration of the boat second class: lever positioned with the resistance between the applied force and the fulcrum (ex: wheel barrow, hedge clippers) answer choices 1 Ns 6 Ns 33.3 Ns Question 2 900 seconds Q. A Mass of 15.0 kg is on an incline with a coefficient of static friction of What is friction and what types of friction are there? (b) What is the tension in the string? coetticient Multiply F by the coefficient of kinetic friction between the player and the sled to get the force required to push the sled across the field. What is the, A:Hey, since there are multiple questions posted, we will answer first question. Mass of the airplane, \[m=9000\text{ kg}\] 2 k = distance known as the radius of gyration Assume the clothesline is massless. W = work done on an object(in joules) A Mark for Review Median response time is 34 minutes for paid subscribers and may be longer for promotional offers. Here a = acceleration approximate, A:Given b. If crew members apply an average force of 100 N in the direction of motion of the 90 kg toboggan for a period of 7.0 s before jumping in, what is the toboggan's speed at that point? What happens to the volume of the water? The work done by a force causes a change in energy of an object, KE = mv The coefficient of kinetic friction between the grass and the sled is 0.30. What does tucking do to moment of inertia in pole vault? I = moment of inertia over his shoulder at the same angle above the, Q:QUESTION 6 Your question is solved by a Subject Matter Expert. 27 N Mass of sled m = 80 kg The coefficient of kinetic friction between the grass and the sled is 0.30. Start your trial now! 4 the collision. third class: lever positioned with the applied force between the fulcrum and the resistance (ex: shovel, bicep curl). Product of force and the amount of displacement in the direction of that force (means by which energy is transferred from one object or system to another) 5 - Are the objects described here in static Ch. 32. 0.77 m Draw A. 5 - A 2.0 kg ball is suspended by two light strings as Ch. A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. A 58 kg person steps on a scale in an elevator. 5 - A 2200 kg truck has put its front bumper against Ch. SALARY. Chapter 5 AP Physics - Campbell/Staelgrave Quiz - Quizizz 5 - Decide whether each of the following is true or Ch. Acceleration of the elevator = a= ??? Pushing Blocks Your question is solved by a Subject Matter Expert. m = 55 kg P = Fd/t (increases in impact velocity and temp increase COR). block on the, Q:9) Two blocks, A and B, are being pulled to the right along a horizontal surface by a horizontal, Q:Group Practice Problem: A 100 kg shot putter pushes forward and upward on a 4 kg F SOLVED: 32. Two football players are pushing 60 kg blocking sled across *Response times may vary by subject and question complexity. The coefficient of static friction between the box and the bed of the truck is 0.800. Free-Body Diagram Hayden and Amy are pushing/pulling a table (150 kg) up a flight of stairs. Here, m is the mass of the sled and a is the, Q:Problem 4: A crate sits on a rough surface. 18 N B. Two people pull on a rope in a tug-of-war. A football player at practice pushes 65 kg blocking sled across the field at a constant speed. 5 - A 2.7 g Ping-Pong ball has a diameter of 4.0 cm. Ch. How much force must he apply to the sled? (b) If the net force is tripled and the mass, Q:HW1: A student observes a drone flying in the H = mk2w. 5 - The ramp in Figure P5.75 is frictionless. 60 N C. 180 N D. 600 N Expert Solution Want to see the full answer? what are common external forces of momentum? 60 N C. 180 N D. 600 N Solution Verified Create an account to view solutions Recommended textbook solutions 5 - Elite quarterbacks can throw a football 70 m. To Ch. A spring is stretched by applying a force to it by hands. (b) If all other conditions are the same but the ramp has a friction force of 1.9 N, what is the acceleration? A football player at practice pushes a 60 kg blocking sled across the field at a constant speed. m = 60 kg m = total body mass Scale reads = 334 N = F (a) What total force resists the motion of the car, boat, and trailer, if the car exerts a 1900-N force on the road and produces an acceleration of 0.550 m/s2? I = moment of inertia The answer is independent of the velocity of the gymnastshe can be moving up or down or can be instantly stationary. S A 18 N B. 60 N C. 180 N D. 600 N. Find answers to questions asked by students like you. The ramp is tilted at 20 and is frictionless. First week only $4.99! Units = kg m2/s Question 4 mass of the boat (m) = 1000 kg 5 - A football player at practice pushes a 60 kg Ch. given that 5 - a. (b) What is the tension in the string? *The crew members are applying an impulse to the toboggan to change the toboggan's momentum from zero to a max amount. No human can push on a bat with that much force. (c) The elevator then moves with a steady speed of 5 m/s. Solved A football player at practice pushes a 70 kg blocking - Chegg (b) If all other conditions are the same but the ramp has a friction force of 1.9 N, what is the acceleration? . Force needed to accelerate, Q:Determine the speed of block D if end A of the rope is pulled the pencil does not, A:As per Newton's third law, there is always an equal and opposite force to every force. Consider two blocks, A and B, where m, < mp. If you want any, Q:A car has forces acting on it, as shown below. A1,100 kg car comes uniformly to a stop. the best answet. 5 - Two football players are pushing a 60 kg blocking Ch. Once they stop pushing; how far will the sled slide before coming to rest? This diagram indicates all types of, Q:6. Two football players are pushing 60 kg blocking sled across the field at a constant speed of 2.0 m/s. 55 N c. 160 N d. 540 N This problem has been solved! What is needed to determine the amount of work done on an object? What is happening in this instance? m.a= Fnet DESTION 7 An object is at rest an will remain at rest, Ability to resist a disruption of equilibrium (b) What is the tension in the rope if he accelerates upward at a rate of 1.50m/s2 ? 5 - The 100 kg block in Figure P5.76 takes 6.0 s to Ch. 3 Fnet=F12+F22+2F1F2cos Get access to millions of step-by-step textbook and homework solutions, Send experts your homework questions or start a chat with a tutor, Check for plagiarism and create citations in seconds, Get instant explanations to difficult math equations. The block just begins to slide up the inclined plane when the pushing force shown is 70 N. a = 1.4 m/s2 accelerates 0.01, Q:6. -the more impulse generated against the floor the higher the jump, collision characterized by the exchange of a large force during a small interval; (total momentum before and after impact are =) F=mf F= (65) (3) F= 195 A 590-kg rocket is at rest on the launch pad. (b) What is the force in the hitch between the car and the trailer if 80% of the resisting forces are experienced by the boat and trailer? 5 - A 2.0-m-long, 500 grope pulls a 10 kg block of ice Ch. (a), A:When a body is at rest, the force that is required to just start the motion of the object from rest, Q:55. The mass of the boat plus trailer is 700 kg. Discuss range of motion, speed, and muscle force in the human body with levers? When the elevator is accelerating downward at 3.8m/s2 , the scale reads 60 N. (a) What Is the mass of the backpack? A 20.O-g ball hangs from the roof of a freight car by a string. (most impacts are somewhere between), When two bodies undergo a direct collision, the difference in their velocities immediately after impact is proportional to the difference in their velocities immediately before impact; coefficient of restitution (COR) measures the elasticity of an impact 5 - A fisherman has caught a very large, 5.0 kg fish Ch. 5 - Two workers are sliding a 300 kg crate across the Ch. 5 - a. 5 - A 23 kg child goes down a straight slide inclined Ch. -As a muscle's velocity of contraction increases, its maximum force of contraction decreases, capacity to do work What does the scale read then? Each pull with a 3 One is a 2000N forward push by, A:a) This is a full-time position that will require working occasional weekends, nights, and holidays. A boy pushes the sled and it (b) What is the tension in the rope if he accelerates upward at a rate of 1.50 m/s2? A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. (a) What is the tension in the rope if he climbs at, Q:A 2.0-kg block is at rest on ramp which makes 20 with the horizontal. 5 - Raindrops can fall at different speeds; some fall Ch. 5 - In Figure Q5.21, block 2 is moving to the right. Ch. Mass of the rocket (m) = 900 kg Solved A football player at practice pushes a 55 kg | Chegg.com The mass of the pig is 200 kg. -Base of Support: This consists of the area enclosed by the outmost edges of the body in contact with the supporting surface of surfaces. A football player at practice pushes a 70 kg blocking sled across the field at a constant speed. F = 20 N, 3. initial speed of ball , u = 0 m/s *Response times may vary by subject and question complexity. The mass of the (b) Find the maximum acceleration the truck can have before the box slides. We dont have your requested question, but here is a suggested video that might help. 5 - It is friction that provides the force for a car Ch. Its engines produce 1.250107 N of thrust, and air resistance is 4.50106 N. What is the rocket's acceleration? Transcribed Image Text: Friction Group Practice Problem: The coefficient of dynamic friction between the grass and a 200 kg football blocking sled is 0.20. . 2003-2023 Chegg Inc. All rights reserved. As a baseball is being caught, its speed goes from 30 to 0 m/s in about 0.005 s. Its mass is 0.145 kg. What is a resultant joint torque in the body? - an, A:The interaction diagram is also known as the system schema. What net Ch. F = force 1. relative roughness and hardness of the surfaces. The force on a baseball as with a bat can be more than 8,000 lb. . The coefficient of kinetic friction between the grass and the sled is 0.30. Forward force on the boat (F) = 2000 N, Q:A car with a mass of 1000.0 kg accelerates from 0 to 90.0 km/h in 10.0 s. (a) What is its, A:a)Weknow,V=u+atgiven,V=90km/h=90x1033600=25m/su=0t=10, Q:A force of 35.0 N is required to start a 6.0-kg box moving across a horizontal concrete floor. 1. She needs to move a heavy crate of bananas ( m = 80 kg) to the, Q:Mr. Vollmayer pulls his children (21kg and 24kg) on a sled (5kg). A 90 kg hockey player skating with a velocity of 6 m/s collides head-on with an 80 kg player traveling at 7 m/s. Find answers to questions asked by students like you. (b) What is the size of the force acting on it? The coefficient of kinetic friction between the grass and the sled is 0.30. 0.68 m C.1.0 m D. 6.6 m, Two football players are pushing 60 kg blocking sled across the field at a constant speed of 1.5 m/s_ The coefficient of kinetic friction between the grass and the sled is 0.30. A football player at practice pushes a 60 kg blocking sled across the field at a constant speed.

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