A smooth chain \( A B \) of mass \( \mathrm{m} \) rests against a surface in the form of a quart...

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A smooth chain \( A B \) of mass \( \mathrm{m} \) rests against a surface in the form of a quarter of a circle of radius \( R \). If it is released from rest, the velocity of the chain after it comes over the horizontal part of the surface is
(a) \( \sqrt{2 \mathrm{gR}} \)
(b) \( \sqrt{\mathrm{gR}} \)
(c) \( \sqrt{2 \mathrm{gR}\left(1-\frac{2}{\pi}\right)} \)
(d) \( \sqrt{2 \operatorname{gR}(2-\pi)} \)
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