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2015-08-31T17:25:51+05:30
If the external force on a system is zero ,the momentum of the system remains constant .
Momentum of two bodies before collision is equal to the momentum after collision . 
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2015-08-31T22:35:05+05:30

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If there is no external force is acting on the system of particles the momentum of a system particles remains conserved.
Ex. Recoil of gun, Rocket Propulsion etc.
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