question_answer

A sphere is spinned in a clockwise direction by   angular velocity \[\frac{{{V}_{0}}}{R}\]and then it is released to a rough surface. The time elapsed by the sphere, till it starts pure rolling (coefficient of friction is\[\mu \]) is [Radius of sphere is R].            

A) \[\frac{2{{V}_{0}}}{7\mu g}\]

B) \[\frac{2{{V}_{0}}}{5\mu g}\]

C) \[\frac{3{{V}_{0}}}{5\mu g}\]

D) \[\frac{5{{V}_{0}}}{7\mu g}\]