A Rock Falls from a Vertical Cliff That Is 4

A rock falls from a vertical cliff that is 4.0 m tall.At what speed will the gravitational potential energy of the rock-Earth system (relative to the base of the cliff) be equal to its kinetic energy? Assume that air has no effect on the motion of the rock.

A) 3.1 m/s
B) 4.4 m/s
C) 6.3 m/s
D) 8.9 m/s
E) 13 m/s

Correct Answer:

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