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A pulley fixed to the ceiling carries a ...

A pulley fixed to the ceiling carries a string with blocks of mass `m` and `3m` attached to its ends. The masses of string and pulley are negligible .When the system is released, its center of mass moves with what acceleration

A

0

B

`g//4`

C

`g//2`

D

`-g//2`

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The correct Answer is:
B
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