A person stands on the edge of a cliff.She throws three identical rocks with the same speed.Rock X is thrown vertically upward,rock Y is thrown horizontally,and rock Z is thrown vertically downward.If the ground at the base of the cliff is level,which rock hits the ground with the greatest speed if there is no air resistance?
A)Rock X
B)Rock Y
C)Rock Z
D)They all hit the ground with the same speed.

Question

Quizplus · Accepted Answer

The three rocks have the same initial speed and the only force acting on them during the fall is gravity, which is the same for all three rocks. Therefore, neglecting air resistance, they will hit the ground with the same speed.

A Person Stands on the Edge of a Cliff