A ring of radius R is first rotated with an angular velocity `omega_(0)` and then carefully placed on a rough horizontal surface. The cofficent of fgriction between the surface and the ring is `mu`. Time after which its angular speed is reduced to half is

Options

A. `(omega_(0)mu R)/(2g)`
B. `(omega_(0)mu R)/(2mu R)`
C. `(2omega_(0)R)/(mu g)`
D. `(omega_(0)R)/(2mu g)`

Answer

D