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15. In the system shown in the figure, the acceleration of \( 1 \mathrm{~kg} \) block is (a) \( ....
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15. In the system shown in the figure, the acceleration of \( 1 \mathrm{~kg} \) block is
(a) \( \frac{g}{2} \) downwards
(b) \( \frac{g}{2} \) upwards
(c) \( \frac{g}{4} \) downwards
(a) \( \frac{g}{2} \) downwards
(b) \( \frac{g}{2} \) upwards
(c) \( \frac{g}{4} \) downwards
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