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A particle of mass m is fixed to me one ...

A particle of mass m is fixed to me one end of a light right rod of length l and rotated in a vertical circular path about its other end. The minmum speed of the particle at its highest point must be

A

zero

B

`sqrt(gl)`

C

`sqrt(1.5gl)`

D

`sqrt(2gl)`

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The correct Answer is:
a
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