1. The problem statement, all variables and given/known data A ball of mass 5.0kg moving at a speed of 5.0m/s has a head on collision with a stationary bal of mass 6.0kg. If the collision were perfectly elastic what would be the speeds of the two balls after the collision? 2. Relevant equations P = mv KE = 0.5mv2 3. The attempt at a solution Using together kinetic energy and momentum equations, I can solve for final velocities. http://img855.imageshack.us/img855/6519/centralkootenayj2012010.jpg [Broken] Is this correct?