If a moving ball A collides with another moving ball B, then

Momentum of A = Momentum of B

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(Momentum of A+ momentum of B) before collision = (Momentum of A+ momentum of B) after collision

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neither (a) nor (b)

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Both (a) and (b)

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Solution

The correct option is B
(Momentum of A+ momentum of B) before collision = (Momentum of A+ momentum of B) after collision

Explanation of the correct option
(B): (Momentum of A+ momentum of B) before collision = (Momentum of A+ momentum of B) after collision
According to Law of conservation of momentum, the total momentum before the collision of an objects A and B will be equal to the total momentum after the collision of an objects A and B
Explanation of incorrect option
(A): Momentum of A = Momentum of B
For the momentum to be equal, the velocity and mass of the moving object must be the same.
Hence, if a moving ball A collides with another ball B, then (Momentum of A+ momentum of B) before collision = (Momentum of A+ momentum of B) after collision. Hence option (b) is correct.

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