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Two masses m and M(gt m) are joined by a...

Two masses m and `M(gt m)` are joined by a light string passing over a smooth light pulley. The centre of mass of the system moves with an acceleration

A

`g((M-m)/(M+m))" downward"`

B

`g((M-m)/(M+m))^(2)" downward"`

C

`g((M-m)/(M+m))^(2)" upward if "M ltm`

D

zero

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The correct Answer is:
B
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