If we hang a body of mass \( m \) with the cord in problem 21 , the tangential acceleration of t...

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If we hang a body of mass \( m \) with the cord in problem 21 , the tangential acceleration of the disc will be
(1) \( \frac{m g}{M+m} \)
(2) \( \frac{m g}{M+2 m} \)
(3) \( \frac{2 m g}{M+2 m} \)
(4) \( \frac{M+2 m}{2 m g} \)
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