Two particles A and B are placed as shown in fig. The particle A, on the top of tower, is projec...

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Two particles A and B are placed as shown in fig. The particle A, on the top of tower, is projected
\( \mathrm{P} \) horizontally with a velocity \( u \) and particle \( B \) is

W projected along the surface towards the tower, simultaneously. If both particles meet each other, then the speed of projection of particle \( B \) is [ignore any friction]
(1) \( d \sqrt{\frac{g}{2 H}}-u \)
(2) \( d \sqrt{\frac{g}{2 H}} \)
(3) \( d \sqrt{\frac{g}{2 H}}+u \)
(4) \( u \)
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