1. The problem statement, all variables and given/known data If Inga, the Laboratory Assistant, rolls a spare head down a 4 m ramp because it was spherical and solid and too heavy at 4.5 kg at a speed of 4.5 m/s, what was its total kinetic energy? 2. Relevant equations KE = (1/2) I ω^2 I = (2/5) MR^2 3. The attempt at a solution Basically, I'm not sure how to solve this without the sphere's radius. Any help, solutions, or hints would be highly appreciated.