Question

What is the essential condition for the validity of the law of the conservation of the linear momentum?

Answer 1

Answer:

the essential condition for the validity of the law of the conservation of the linear momentum is that the total initial momentum must be equal in magnitude to the total final momentum of the body.

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Answer 2

Answer:

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If the net external force acting on a system of bodies is zero, then the momentum of the system remains constant. ... We have to remember that the momentum of the system is conserved and not that of the individual particles.