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A ring of radius R is first rotated with...

A ring of radius `R` is first rotated with an angular velocity `omega` and then carefully placed on a rough horizontal surface. The coefficient of friction between the surface and the ring is `mu`. Time after which its angular speed is reduced to half is

A

`(2omegaR)/(mug)`

B

`(omega_0R)/(2mu g)`

C

`(omega_0mu R)/(2g)`

D

`(omega_0g)/(2mu R)`

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