1. The problem statement, all variables and given/known data A particle (nonrelativistic) of mass M and with kinetic energy E0 collides with an electron at rest of mass m. Show from elementary considerations (i.e. rst year physics) that the maximum energy of the electron after the collision is E0(4m/M). Determine this energy for a 5.0 MeV alpha particle. 2. Relevant equations E = 1/2 m V2 Pin = Pout 3. The attempt at a solution I made v the subject of the formula in the kinetic enegy equation. Then subbing this into the momentum equation just seems like a big mess. Where else should I start? or am I on the right track? Thanks!