A person applies a constant 25-N force to a heavy rock for 30 seconds, but the rock does not move. What is the work done on the rock?

For a system in simple harmonic motion, the time required to complete one cycle is the:

An object is thrown straight upward with a speed of 19.6 m/s. How long does it take to reach maximum height?

In general, sound travels fastest through:

A 50-kg swimmer dives horizontally from a 200-kg raft with a speed of 2.0 m/s. The raft is initially at rest. What is the speed of the raft immediately after the diver jumps?

A rubber ball and a lump of putty have equal mass and strike a wall with equal speed. The ball bounces back with nearly the same speed, while the putty sticks. Which experiences the greater momentum change?

A light object and a heavy object slide with equal speeds on a level frictionless surface and then move up the same frictionless hill. Which rises to the greater height?

Two students leap from the same height above a lake. One jumps straight out horizontally, and the other simply steps off with no horizontal speed. Neglect air resistance. Compare the times to reach the water.

A ball is thrown straight upward. What is its acceleration at the highest point?

If you push twice as hard against a stationary brick wall, the amount of work you do on the wall: