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law of conservation of linear momentum

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can someone please explain me the law of conservation of linear momentum in physics ? I would be really thankful :D
 
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In simple words "Momentum Before Collision = Momentum After Collision" or "m1u1+m2u2 = m1v1+m2v2"
 
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thnkx people but can explain me this question J02 Q4 part(c) of paper 2 ???? it requires explanation...
 

PlanetMaster

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Since 'p=mv' and 'v=velocity' so for change in velocity use 'v-u'.
So ∆p=m(v-u).
 
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