A particle is projected from a point A with velocity \( u \sqrt{2} \) at an angle of with horizo...

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A particle is projected from a point A with velocity \( u \sqrt{2} \) at an angle of with horizontal as shown in
\( \mathrm{P} \)
figure. It strikes the plane \( \mathrm{BC} \) at right angles. The
W
velocity of the particle at the time of collision is
(1) \( \frac{\sqrt{3} u}{2} \)
(2) \( \frac{u}{2} \).
(3) \( \frac{2 u}{\sqrt{3}} \)
(4) \( u \)
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