1. The problem statement, all variables and given/known data Two astronauts, one of mass 62 kg and the other 85 kg, are initially at rest in outer space. They then push each other apart. How far apart are they when the lighter astronaut has moved 5.0 m? 2. Relevant equations Conservation of momentum. Pi = Pf P1i + P2i = P1f + P2f 3. The attempt at a solution Pi = Pf P1i + P2i = P1f + P2f (62)(0) + (85)(0) = (62)Vf1 + (85)Vf2 How do I solve for 2 unknowns when you can't cancel the masses out because the masses are different?