A Person Stands on the Edge of a Cliff

Multiple Choice

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.