A point mass of 1 kg collides elastically with a stationary point mass of 5 kg . After their collision, the 1 kg mass reverses its direction and moves with a speed of $2 \mathrm{~ms}^{-1}$. Which of the following statement(s) is (are) correct for the system of these two masses?
Select ALL correct options:
A
Total momentum of the system is $3 \mathrm{~kg} \mathrm{~ms}^{-1}$
B
Momentum of 5 kg mass after collision is $4 \mathrm{~kg} \mathrm{~ms}^{-1}$
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