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According to the law of conservation of momentum, when objects collide in the absence of friction
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According to the law of conservation of momentum, when objects collide in the absence of friction

User Mralex
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When two objects collide, in the absence of any additional external forces acting on the pair of objects, momentum is conserved precisely because the collision is just an interaction between the two objects. That is, it's a Newton's third law problem.

User PhilChuang
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