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A ball of mass \( m \) is released from point \( A \) inside a
\( \mathrm{P} \) smooth wedge of mass \( m \) as

W shown in figure-4.113. What is the speed of the wedge when the ball reaches point \( B \) ?
(A) \( \left(\frac{g R}{3 \sqrt{2}}\right)^{1 / 2} \)
(B) \( \sqrt{2 g R} \)
(C) \( \left(\frac{5 g R}{2 \sqrt{3}}\right)^{1 / 2} \)
(D) \( \sqrt{\frac{3}{2} g R} \)
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