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2015-08-20T17:57:07+05:30

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B) 
Newtons Second law...
     It states that the force is proportional to the time rate of change of momentum. 

  F = (p1 - p2) / (t2 - t1) = dp / dt

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A) states that if there is a force, then a particle will change its velocity.
B) Third law states that the action reaction forces occur in pairs.

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