1. The problem statement, all variables and given/known data [If a ball of mass (400g) falls from a height of (1.5m) towards the ground, and rebounds a height of (1m), find: a) Initial Potential Energy b) Kinetic Energy of ball before hitting the ground c) Velocity at which it reaches the ground d) The velocity at which it leaves the ground e) Initial Kinetic Energy f) Energy lost to it's surroundings] 2. Relevant equations GPE = mgh KE = 1/2mv^2 (I think this is relevant..) and I don't know what else, that's the problem.. 3. The attempt at a solution a) = mgh = .4x10x1.5 = 6J? b) Final KE = Initial GPE (I think...), so = 6J? c) v = square root of 37? d) no idea where to even start.. e) I think this is 0, because it doesn't move initially? f) no idea where to start... Anyone able to provide me some insight? Thanks.