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In the law of conservation of linear momentum why does the force that body A (first) exert on body B (second) equal the rate of change of momentum of body B? And why does the force that body B exerts equal the rate of change of momentum of body A?

Emilio Pisanty
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Waleed Qaiser
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1 Answers1

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Force is defined as the rate of change of momentum. You're asking a question a bit like "If I change a bodies linear kinetic energy, why am I changing it's velocity", you just are because those two quantities can be defined by the other.