1. The problem statement, all variables and given/known data 2. Relevant equations Conservation of energy 3. The attempt at a solution All I'm thinking for this problem is to just use conservation of energy, since the cube is frictionless and it is just sliding down the wedge, aren't the only forces that are at play is just gravity? I don't see any other way how the mass or the length of the wedge that can be implemented. So far I've got Vf = sqrt(2gH) and since he is asking for m --> 0/ ∞ , I'm just thinking if m --> ∞ > M(mass of the wedge) well the wedge would just break?