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Each pulley in figure has radius \( r \) and moment of inertia \( I \). The acceleration of the block is
(1) \( \frac{(M-m) g}{\left(M+m+\frac{2 I}{r^{2}}\right)} \)
(2) \( \frac{(M-m) g}{\left(M+m-\frac{2 I}{r^{2}}\right)} \)
(3) \( \frac{(M-m) g}{\left(M+m+\frac{I}{r^{2}}\right)} \)
(4) \( \frac{(M-m) g}{\left(M+m-\frac{I}{r^{2}}\right)} \)
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