複選題
21. Two balls of masses my = 1 kg and mo = 100 kg, with initial speed 1 m/s and
10 m/s, respectively, collide inelastically in space. They stick together after
the collision. Which of the following is true in the Center of Mass Frame?
(A) The total momentum does not change；
(B) The total kinetic energy does
not change；
(C)The magnitude of velocity change of me is less than that of
mi；
(D) The magnitude of momentum change of me is less than that of my；
(E) The magnitude of kinetic energy change of me is less than that of my.
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