A Rock Falls from a Vertical Cliff That Is 4

question 108

Multiple Choice

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

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