a deuterium nucleus (mass 2.00) moving at 650 m/s collides with a helium nucleus (mass 4.00) moving at 480 m/s in the opposite direction. After collision the deuterium moves at 210 m/s opposite the initial direction of motion.
a) what is the velocity of the helium nucleus after the collision?
b) what percentage of the initial total energy is lost in the collision?