A Rock Is Dropped from a High Tower and Falls

A rock is dropped from a high tower and falls freely under the influence of gravity. Which one of the following statements concerning the rock as it falls is true? Neglect the effects of air resistance.

A) The rock will gain an equal amount of momentum during each second.
B) The rock will gain an equal amount of kinetic energy during each second.
C) The rock will gain an equal amount of speed for each meter through which it falls.
D) The rock will gain an equal amount of momentum for each meter through which it falls.
E) The amount of momentum the rock gains will be proportional to the amount of potential energy that it loses.