A body of mass \( \mathrm{m} \) is rotating in a vertical circle of radius \( r \) with critic...

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A body of mass \( \mathrm{m} \) is rotating in a vertical circle of radius \( r \) with critical speed. The difference in its K.E. at the top and the bottom is
(a) \( 2 \mathrm{mgr} \)
(b) \( 4 \mathrm{mgr} \)
(c) \( 6 \mathrm{mgr} \)
(d) \( 3 \mathrm{mgr} \)
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