Potential and Kinetic energy problem!! 1. The problem statement, all variables and given/known data im still stuck on the assignment: is the potential energy of a marble at the top of a ramp the same as the kinetic energy of the marble at the bottom of the ramp. I dont know the co-efficient of friction of wood but our teacher has told us keywords, they are: PREDICTIONS, measure the length the ball travels after its travelled down the ramp, FINAL VELOCITY and SEARCH DEEPER. so i have no idea what he's talking about 2. Relevant equations ? 3. The attempt at a solution we have measured height of the ramp and different times for the marble, can anyone tell me how i would measure final velocity? im really confused, and what does he mean by search deeper?