1. The problem statement, all variables and given/known data Two particles are in a perfectly inelastic collision with no external force acting on them. Particle 1 has m1 and v1>0. Particle 2 has mass m2 and v2<0. Find the loss in kinetic energy after the collision. Express your answer in reduced mass as well as relative velocity. 2. Relevant equations KE=1/2mv^2 Momentum conservation. Reduced mass=m1*m2/(m2-m1) 3. The attempt at a solution So far all I've managed to come up with is the final velocity which is (m1v1+m2v2_/(m1+m2) I'm not sure where to go form here, I've tried writing out the KE after the collision by squaring the final velocity but I cant find a place to go from here.