A ball A is falling vertically downwards with velocity \( v_{1} \)....

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A ball A is falling vertically downwards with velocity \( v_{1} \). It strikes elastically with a wedge
\( \mathrm{P} \) moving horizontally with velocity \( v_{2} \) as shown in the W figure. What must be the ratio \( \frac{v_{1}}{v_{2}} \) so that the ball bounces back in vertically upwards direction relative to wedge?
(1) \( \sqrt{3} \)
(2) \( \frac{1}{\sqrt{3}} \)
(3) 2
(4) \( \frac{1}{2} \)
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