1. The problem statement, all variables and given/known data Uniform ball or mass m and radius r rolls on a horizontal plane without sipping, at the same time moving along a circular path of radius R. Speed of the center of mass is constant and equals v. Find it's kinetic energy. 2. Relevant equations I=2/5 m r^2 3. The attempt at a solution KE of ball's translation T1=(m v^2)/2 KE of ball's rotation T2=(I w^2)/2 ( w - angular velocity, from w r = v => w= v/r) My problem is with the ball moving along a circle of radius R. Where does it come into play? Do i have to add the KE of ball rotation around the center of the circle? Any help will be appreciated.