Question

two blocks are free to slide along the frictionless, wooden track. The block of mass m1=5 kg is released from the position shown, at height h=5m above the flat part of the track. Protruding from its front end is the north pole of a strong magnet, which repels the north pole of an identical magnet embedded in the back end of the block of mass m2=0 kg, initially st rest. The two blocks never touch. Calculate the maximum height to which m2 rises after the elastic collision