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A ball hits a wall head on and sticks to it. If instead the ball bounces off the wall with one-half of the original velocity and the collision lasts the same time, the average force on the ball would be _____ times greater.

What is the gravitational potential energy of a 1-kg block at rest on a table 1 m above the floor?

A pole vaulter clears 6.00 m. What is his velocity just before landing?

Two masses in the figure below rest on a smooth table. A force of 14 N is applied on A. What force does B exert on A?

A 150 N sled is being pulled up a 28° rough ramp at constant speed by a force of 100 N parallel to the ramp. With what acceleration will the crate slide down, if it is released at some point on the ramp?

A roller coaster travels around a vertical 8-m radius loop. Determine the speed at the top of the loop if the normal force exerted by the seats on the passengers is equal to ¼ of their weight.

A flywheel with a radius of 0.15 m starts from rest and reaches an angular speed of 12.0. What is the wheel’s angular acceleration if it reaches this speed in 4.0 s?

A ball with momentum p strikes a wall and bounces off at the same speed. The change in the ball’s momentum is:

An object that is acted upon by a net force of 20 N is moving with an acceleration of 10 m/s2. What is the mass of the object?

A meter stick is supported at the 50-cm mark. A 0.40 kg mass is hanging at the 20 cm mark and a 0.60 kg hanging at the 80-cm mark. Where should a third mass that weighs 0.30 kg be hung to keep the stick balanced?