Doubt from collision

Question 20

Ans is d?

Yes correct tell the working.

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Taking x direction along line of impact
Velocity of A in y direction v_{y} = u sin30°
And velocity of B will be v_{x} =u cos30°
And now for inelastic collison between A and C
mu \over 2 = 2mv
So v= u \over 4 where v is common velocity of A and C
Now calculate ratio

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