1. The problem statement, all variables and given/known data 2. Relevant equations ΔK1+ΔK2+ΔU1+ΔU2 = 0 3. The attempt at a solution The biggest stumbling block I have is setting up the initial and final conditions. First the initial: 1)Does m1 have potential energy in this setup? Part of me thinks it would have m1gh but I could also see it having zero potential energy (being on the table top). 2)I assume the final state would be right when m1 hits the ground (m2 has already hit). If this is the case, don't I need information at some intermediate state between the two? For instance, when m1 leaves the table? Thanks.