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Two particle of masses m and 2m are coli...

Two particle of masses `m` and `2m` are coliding elastically as given in figure. If `V_(1)` and `V_(2)` speed of particle just after collision then

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`A rarr ( r,s,t), B rarr ( r,t) , C rarr ( q,t ) , D rarr ( p,t `
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