Question

A light and a heavy body have equal momentum.which one has greater kinetic energy

Answer 1

momentum is given by mass of thebody times its velocity since given that both heavy and light body have same momentum, the heavier body will have to maintain a lower velocity in order to compensate its mass and make the momentum equal, now therefore the lighter body has to maintain a huge velocity, the kinetic energy 

Answer 2

because both bodies have same momentum, it means light body has high velocity . so contain greater kinetic energy