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A ball is dropped at t=0 from a height o...

A ball is dropped at `t=0` from a height on a elastic surface. Identify the gragh which correctly represents theation of kinnetic energe K with time t.

A

B

C

D

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The correct Answer is:
B
`K =1/2mv^(2) =1/2m(g t^(2))`
i.e. `Kpropt^(2)`
i.e. during downward motion. `K-t` graph is a parabola passing through origin with K increasing with time. Then in upward journey K will decrease with time.
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