Ball A strikes with velocity u elastically with identical ball B at rest, inclined at an angle of with line joining the centers of two balls. What will be the speed of ball B after the collision:

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\frac{u \sqrt{3}}{2}

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\frac{u}{2}

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\frac{u}{\sqrt{2}}

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Solution

The correct option is A u
It is not possible for ball $A$ to collide with ball $B$ at an angle to the line joining their centers because it will always consider with the line joining their centers
$\to$ It will always collide along the line joining their centers.
As the collision is elastic the velocity of ball $B$ will be $u$ .

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