1. The problem statement, all variables and given/known data A hoop, rolling at a constant velocity of 4m/s, rolls up a hill .8 m tall on to flat surface . a) what percent of its initial total K.E. ( before rolling up the hill) is due to rotational K.E. b) how fast is it moving on top of hill. 2. Relevant equations i=mr2 w=vr 3. The attempt at a solution i am completely stumped, every equation i can find either requires a mass or a R or both. This problem looks like it should be easy thats why i feel so dumb for not knowing it.