Two particles \( A \) and \( B \) are placed as shown in the figure.The particle \( A \), on the...

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Two particles \( A \) and \( B \) are placed as shown in the figure.The particle \( A \), on the top of tower, is projected horizontally with a velocity \( u \) and particle \( B \) is 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) \( d \sqrt{\frac{g}{2 H I}}+u \)
(4) \( u \)
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