A rock is dropped from the top of a tall tower. Half a second later another rock, twice as massive as the first, is dropped. Ignoring air resistance,
(A) the distance between the rocks increases while both are falling.
(B) the acceleration is greater for the more massive rock.
(C) the speed of both rocks is constant while they fall.
(D) they strike the ground more than half a second apart.
(E) they strike the ground with the same kinetic energy.
