A smooth ball A travels towards another ...

A smooth ball A travels towards another identical ball B with a velocity u. Ball B is at rest and the impact parameter d is equal to `sqrt(3) R` where `R` is radius of each ball. Due to impact the direction of motion of ball A changes by `30^(@)`. Find the velocity of B after the impact. It is given that collision is elastic

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The correct Answer is:

`(u)/(2)`

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