Question

A metal ball with a mass 3 kg is left to fall from a point A,20m above the ground.The ball moves past B and C.Take thr ground level D as our frame of reference .

Calculate the gravitational potential energy of the ball at A.

Answer 1

The gravitational potential energy of the ball at A is

$$GPE=mgh=3·9.8·20=588\text{ J}.$$