Answers

2016-03-25T08:54:47+05:30
When work done by external forces are 0 or when Fext=0,then momentum of the system if conserved.Because F=Fext+Fint and Fint =0
Use the formula m1u1+m2u2=m1v1+m2v2
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2016-03-25T09:01:26+05:30
Conservation of momentum is a fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system. 
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