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Question

Two balls of mass m and 2m each have momentum 2P and P in the direction shown in figure. During collision they exert an impulse of magnitude P on each other.

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Solution

pf=pi+I
pmf=2pp=p;p2mf=p+p=2p
um=2p/m;u2m=p/2m;vm=p/m,v2m=2p/2m=p/m
Therefore, it is perfectly inelastic collision, e = 0

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