When a person weighing 50 kg walks from the stern to the bow of a small boat with a mass of 100 kg and a length of 3.6 meters, how far will the bow move? A neutron with mass m undergoes a perfectly elastic collision with a nucleus of mass m'. Given that the initial kinetic energy of the neutron is Eo, show that the maximum value of the neutron's kinetic energy loss during the collision is 4mm'Eo/(m +m').