A Solid Spherical Ball of Mass M and Radius R

Multiple Choice

A solid spherical ball of mass M and radius R rolls without slipping down an inclined plane from a height h.Compare the center of mass speed of the ball at the bottom of the plane with the speed obtained if the ball were simply dropped from a height h.

A) rolling ball is (5/7) ^1/2 times slower
B) rolling ball is 7/5 times faster
C) rolling ball is (2/3) ^1/2 times slower
D) rolling ball is 2/3 times faster
E) rolling ball and dropped ball have the same speeds