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A rock of mass m is dropped to the groun...

A rock of mass `m` is dropped to the ground from a height `h`. A second rock, with mass `2m`, is dropped from the same height. When the second rock strikes the ground, what is its kinetic energy? (a) Twice that of the first rock, (b) four times that of the first rock, (c) same as that of the first rock, (d) half as much as that of the first rock, (e) impossible to determine.

A

twice that of the first rock

B

four times that of the first rock

C

the same as that of the first rock

D

half that of the first rock

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The correct Answer is:
A
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