1. The problem statement, all variables and given/known data A ball rolls without slipping down incline A, starting from rest. At the same time, a box starts from rest and slides down incline B, which is identical to incline A except that it is frictionless. Which arrives at the bottom first? (a) The ball arrives first. (b) The box arrives first. (c) Both arrive at the same time. (d) It is impossible to determine. 2. Relevant equations KE = 1/2 I ω2 KE = 1/2 m v2 3. The attempt at a solution I answered D because i felt that you would need to know how much work had been done by friction. The correct answer is B however, and i'm not certain why. Does the ball rolling down the incline have both rotational and translational energy?