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A hollow vertical cylinder of radius r and height h has a smooth internal surface. A small particle is placed in contact with the inner side of the upper rim, at point A, and given a horizontal speed u, tangentical t the rim. it leaves the lower rim at point B, vertically below A. If n is an integer then

A

`h/(2piR)`

B

`v_0/(sqrt(2gh))`

C

`(2piR)/h`

D

`v_0/(2piR)(sqrt((2h)/g))`

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The correct Answer is:
D
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