A uniform sphere with a radius of r and a mass of m, the initial velocity of the center of mass VO and the initial angular velocity w0 = 0, slide along a 8 angle inclined plane, as shown in Figure; if the coefficient of kinetic friction between the inclined plane and the small ball is u, How long does it take for the sphere to change from sliding to pure rolling motion? In addition, when the ball changes to pure rolling motion, what are its centroid velocity and angular velocity? [Hint: If the ball is pure rolling, we know v = rw] < @0 k G m VO