# Classic Rotational Motion Problem

A Solid sphere is rolling purely on a rough horizontal surface ( Coefficient of kinetic friction = μ) with speed of centre = V. It collides inelastically with a smooth vertical wall at a certain moment, the coefficient of restitution being $$\frac{1}{2}$$. The sphere will begin pure rolling after a particular time which can be expressed in form of $$\frac{aV}{bμg}$$ where a and b are co-prime.

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