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A particle of mass m attached to a strin...

A particle of mass `m` attached to a string of length `l` is descending circular motion on a smooth plane inclined at an angle `alpha` with the horizontal. For the particle to reach the highest point its velocity at the lowest point should exceed.

A

`sqrt(5gl)`

B

`sqrt(5gl(cos alpha+1))`

C

`sqrt(5gl//tan alpha)`

D

`sqrt(5gl sin alpha)`

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The correct Answer is:
D
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