A ball 'A' of mass 'm' moving along posi...

A ball 'A' of mass 'm' moving along positive x-direction with kinetic energy `K` and linear momentum "p" undergoes elastic head on collision with a stationary ball 'B' of mass `M`. After the collision, the ball `A` moves along negative x-direction with kinetic energy `K//9`, the final linear momentum of the ball `B` is

`P//3`

`4P//3`

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Verified by Experts

The correct Answer is:

Law of conservation of linear momentum.
`m u_(1) = -mv_(1) + P_(B)`.

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