Select One Option Correct from the following : A point mass of 1 kg collides elastically with a stationary mass of 5 kg. After their collision, the 1 kg mass reverses its direction and moves with speed of 2 m/s. Which of the following statement(s) is (are) correct for the system of these two masses?
(A)Total momentum of the system is 3 kg m/s.
(B)Momentum of 5 kg mass after collision is 4 kg m/s.
(C)Kinetic energy of the centre of mass is 0.75 J.
(D)Total kinetic energy of the system is 4 J.
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Answer: i think c
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