elastic collision: a neutron of mass 1.00 u traveling with velocity 6.50 x 105 ms-1 collides head on with a stationary carbon atom of mass 12.00 u. The carbon atom moves off in the same direction with velocity 1.00 x 105 ms-1. Calculate the velocity of the neutron after the collision. State what happens to the kinetic energy as a result of this collision.??????????????????