1. A 65-kg ice skater stands facing a wall with his arms bent and then pushes aw
ID: 1363749 • Letter: 1
Question
1. A 65-kg ice skater stands facing a wall with his arms bent and then pushes away from the wall by straightening his arms. At the instant at which his fingers lose contact with the wall, his center of mass has moved 0.50 m , and at this instant he is traveling at 2.5 m/s .
a)What is the average force exerted by the wall on him?
b)What is the work done by the wall on him?
c)What is the change in the kinetic energy of his center of mass?
2. A 1.0-kg cart and a 0.50-kg cart sit at different positions on a low-friction track. You push on the1.0-kg cart with a constant 2.5-N force for0.15 m . You then remove your hand, and the cart slides 0.35 m and strikes the 0.50-kg cart.
a)What is the work done by you on the two-cart system?
b)How far does the system's center of mass move while you are pushing the 1.0-kg cart?
c)By what amount does your force change the kinetic energy of the system's center of mass?
Explanation / Answer
1. A 65-kg ice skater stands facing a wall with his arms bent and then pushes aw
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