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for q.9,
momentum before the collision = 2mu + (-mu) => mu
now as the collison is elastic, momentum will b conserved. it will b same after the collison ,
find momentum of all 4 cases given, the one havin momentum equal to mu is the ans, and dats A!
kia kia kia...?? awaqai answer aajata hai aisay bhee...??? try kia hai aap nay aisay..???