Question

Prove the initial momentum of a system of two colliding masses is equal to their final momentum?

Answer 1

If no external force acted on body then body will remain in its state if rest or in motion i.e.it will keep on moving with the same velocity or remain in rest.

In this case initial momentum will be equal to final momentum and no change will occur according to second law of motion.

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# Nikky

Answer 2

Hence,
We can say that the total linear momentum of a system of particles is equal to the product of mass of the whole system and the velocity of the centre of mass.