A cardinal (Richmondena cardinalis) of mass 4.50×10?2 kg and a baseball of mass 0.144 kg have the same kinetic energy. What is the ratio of the cardinal's magnitude of momentum to the magnitude of the baseball's momentum?
A man weighing 670 kg and a woman weighing 420 kg have the same momentum. What is the ratio of the man's kinetic energy to that of the woman ?