A ball of mass 0.40 kg rolls towards a wall with a velocity of +2.0 m/s, hits the wall, and bounces back at the same speed. What is the change in momentum of the ball? 1.6 kg m/s

-1.6 kg m/s

-3.2 kg m/s

0 kg m/s

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

The mass of a bowling ball is 10 kg and the mass of a ping pong ball is 0.015 kg. if the two objects are 5 meters apart, what is the gravitational force ?