Conservation of momentum for a system relies on the principle of action-reaction (Newton's third law) and the relationship between force and change in momentum (Newton's second law).
Conservation of momentum in a collision between particles can be understood on the basis of:
Asked in UPSC NDA 2 2015 · Topic: Mechanics (Systems of Particles and Collisions)
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Answer: C. Both Newton's second law of motion and Newton's third law of motion
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