You drop a rock off a bridge. when the rock has fallen 4 m, you drop a second rock. as the two rocks continue to fall, what happens to their velocities?

a. both increase at the same rate.
b. the velocity of the first rock increases faster than the velocity of the second.
c. the velocity of the second rock increases faster than the velocity of the first.
d. both velocities stay constant.

option A.

Explanation:

The correct answer is option A.

Two rocks are off a bridge first rock is fallen 4  when the second rock is dropped.

Both the rock is dropped under the effect of acceleration due to gravity so, the rate of change of the velocity for both the rock particle will be the same.

Hence, the first rock will reach ground earlier than the second rock because the rate of change of both the rock is at the same rate.

real, smaller and upside-down.   so the answer should be b.