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A point mass of 1kg collides elastically...

A point mass of 1kg collides elastically with a stationary point mass of 5 kg. After their collision, the 1kg mass reverses its direction and moves with a speed of `2ms^-1`. Which of the following statements (s) is (are) correct for the system of these two masses?

A

Total momentum of the system is 3 kg `ms^(-1)`

B

Momentum of 5 kg mass after collision is 4 kg `ms^-1`

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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