A disk \( A \) of radius \( r \) moving on perfectly smooth surface...

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A disk \( A \) of radius \( r \) moving on perfectly smooth surface at speed \( v \) undergoes an elastic collision
\( \mathrm{P} \) with an identical stationary disk \( B \). Find the velocity of the disk B after collision if the impact parameter
W. is \( r / 2 \) as shown in the figure
(1) \( \frac{v \sqrt{15}}{4} \)
(2) \( \frac{v}{4} \)
(3) \( \frac{v}{2} \)
(4) \( \frac{\sqrt{3} v}{2} \)
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