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.Assuming the elevation loss of the three rocks is the same (the base of the cliff is flat),which rock hits the ground with the highest speed?
A)They all hit the ground with the same speed.
B)Rock X
C)Rock Y
D)Rock Z

Question

Quizplus · Accepted Answer

All three rocks have the same initial kinetic energy and potential energy loss. The only difference is the direction of their initial velocity. Due to conservation of energy, they all hit the ground with the same speed.

A Person Stands on the Edge of a Cliff