1. The problem statement, all variables and given/known data A uniform hollow spherical ball of mass 1.75kg and radius 40.0cm rolls without slipping up a ramp that rises 30 degrees above the horizontal. The speed of the ball at the base of the ramp is 2.63m/s. while the ball is moving up the ramp, find the acceleration of its center of mass and the friction force acting on it due to the surface of the ramp. 2. Relevant equations I=2/5MR^2 K=1/2mv^2 U=mgh 3. The attempt at a solution I think I want to start out with K1 - Wf= U1+K2. However the problem doesn't state anything about how far the ball travels up the ramp or what its speed is at a certain point on the ramp.