A ring of radius r (and moment of inertia with respect to an axis going through its center of mass I=mr2) is given an initial velocity v0. The ring slides for a little while and then starts to roll. What's the velocity of the ring when it rolls without slipping?
A. 0.5v0
B. v0
C. 1.5v0
D. 2.5v0
E. 3.5v0