As there is no external force on the system so the net momentum of the system will be conserved that is
momentum before collision will be equal to momentum after collission.
a)
So in direction perpendicular to i
initial momentum=0
final mometum=
mVa'sin30-2mVb'sin50
So
mVa'sin30-2mVb'sin50=0
Vb'/Va'=sin30/2sin50
=0.326
b)
Now applying conservation of momentum in i
inital momentum= mV0
final momentum,
mVa'ços30+2mVb'cos50
So
mVa'ços30+2mVb'cos50=mV0.............(1)
And in part a we have found that
Vb'/Va'=0.326....(2)
So,
simplifying equation 1
0.866Va'+1.285Vb'=V0
From equation 2
Vb'=0.326Va'
Va'=1.285V0
Vb'=0.419V0
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