1. The problem statement, all variables and given/known data A proton is shot horizontally at a nucleus on a cartesian plane, a distance B above the nucleus. It is deflected upwards in a hyperbolic path and its path becomes parallel to another ray out of the nucleus, distance A away from this ray. Show that A=B using conservation of angular momentum. Assume that the nucleus does not move and that the collision is perfectly elastic. 2. Relevant equations Angular Momentum = Moment of Inertia x Angular Velocity 3. The attempt at a solution I have no bloody idea where to start.