A point mass of 1 kg collides elasticall...

A point mass of `1 kg` 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 statement(s) is (are) correct for the system of these two masses?

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

momentum of 5 kg mass after collision is 4 `kg-ms^(-1)`

Kinetic energy of the centre of mass is 0.75 J

Total kinetic energy of the system is 4 J.

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