A pulley fixed to the ceiling carries a string with bodies of masses m and 3m attached to its ends. The masses of the pulley and the string are negligible, friction is absent. The acceleration of the centre of mass of the system is

- g / 4

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g / 4

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g / 5

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- g / 5

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Solution

The correct option is B $g / 4$

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A pulley fixed to the ceiling carried a thread with bodies of masses $m_{1}$ and $m_{2}$ attached to its ends. The masses of the pulley and the thread are negligible and friction is absent. Find the acceleration of the center of mass of this system.