A 1kg ball is dropped from the top of a cliff and falls with a constant acceleration due to gravity. Assume that effects of air resistance can be ignored.
a. by how much has the balls gravitational potential energy changed after it has fallen by 10m?
b. how fast is the ball going after it has fallen 10m?
c. what is the force that does work on the ball?
d. how much work has been done on the ball?
e. is the work on the ball recoverable?