While leaning out a window that is 7.40 m above the ground, you drop a 0.600-kg basketball to a friend at ground level. Your friend catches the ball at a height of 1.10 m above the ground. Determine the following.
(a) the amount of work done by the force of gravity on the ball
W = J

(b) the gravitational potential energy of the ball-Earth system, relative to the ground when it is released
U0 = J

(c) the gravitational potential energy of the ball-Earth system, relative to the ground when it is caught
Uf = J

(d) the ratio of the change (Uf − U0) in the gravitational potential energy of the ball-Earth system to the work done on the ball by the force of gravity
ΔU
W=