Rolling motion is a combination of translational motion and rotational motion.
Kinetic Energy is associated with each kind of motion and both kinds of kinetic energy must be considered.
KEtot = KEtr + KErot
KEtr = (1/2) m v2
KErot = (1/2) I 2
For an object that rolls without slipping (and that is all we will consider) the linear velocity v and the angular velocity are connected by
v = r
ToC, Ch 11 Vector Product Return to ToC, Ch11, Rolling Motion (c) Doug Davis, 2001; all rights reserved