Is it true that the momentum is conserved when two friends on roller skates are standing $5 m$ facing each other if one of them throws a ball has a mass of $2 kg$ towards the other, and another catches it?

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True

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answer is A.

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Detailed Solution

The above statement is True.
Yes, momentum is conserved. As the law of conservation of momentum states, “For two or more bodies in an isolated system acting upon each other, their total momentum remains constant unless an external force is applied.” So, when two friends on roller skates are standing 5 m facing each other and boy, A throws the ball to boy B, then in order to conserve the momentum, boy A will be moved backwards by the ball. Also, boy B will move backwards at some speed depending on the mass of the ball and the boy since there are no external forces acting on them.

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