A block of mass \( m \) at the end of a string is whirled round in a vertical circle of radius \...

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A block of mass \( m \) at the end of a string is whirled round in a vertical circle of radius \( R \). The critical speed of the block at the top of its swing below which the string would slacken before the block reaches the top is
[DCE 1999, 2001; Similar DCE 2009]
(a) \( R g \)
(b) \( (R g)^{2} \)
(c) \( R / g \)
(d) \( \sqrt{R g} \)
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