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A particle of mass m starts from rest an...

A particle of mass m starts from rest and moves in a circular path of radius R with a uniform angular acceleration `alpha` The kinetic energy of the particle after n revolutions is

A

`n alpha m R^(2)`

B

`2 pi n alpha m R^(2)`

C

`1/2 m n alpha R^(2)`

D

`m n alpha r^(2)`

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The correct Answer is:
B
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