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The kinetic energy K of a particle movin...

The kinetic energy K of a particle moving along a circle of radius R depends on the distance covered a as `K=as^(2)`. The force acting on the particle is

A

`2as^(2)//R`

B

`2as[1+(s^(2)//R^(2))]^(1//2)`

C

`2as`

D

`2aR^(2)//s`

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The correct Answer is:
B
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