A mass \( M \) is supported by a massless string wound round a unif...

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A mass \( M \) is supported by a massless string wound round a uniform cylinder of mass \( \mathrm{M} \) and radius \( \mathrm{R} \). On releasing the mass from
\( \mathrm{P} \) rest, it will fall with acceleration:
(1) \( g \)
(2) \( \frac{1}{2} g \)
(3) \( \frac{1}{3} \mathrm{~g} \)
(4) \( \frac{2}{3} \mathrm{~g} \)
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