1. The problem statement, all variables and given/known data A large, uniform-density cube of styrofoam has a side length of 3.0 m and a mass of 90 kg. It is at rest on a horizontal, frictionless (ice) surface. An ice-skater with a mass of 60 kg is standing at rest, touching one face of the cube. You should consider all of the ice-skater's mass to be located exactly at the position of the cube's side. The ice-skater now pushes off against the cube. When the cube has moved 4.0 m from its starting position, how far has the ice-skater moved? 2. Relevant equations mvi=mvf, hard to tell what other equations come into play 3. The attempt at a solution tried to use conservation of momentum equation (mvi=mvf) to solve, but ended up falling short since I can't determine the velocities of the cube and the ice-skater. I know information about the side length of the cube and the ice skater's position on the cube will be important in figuring out the problem, but i just can't see how they are connected.