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Two blocks are resting on ground with ma...

Two blocks are resting on ground with masses 5 kg and 7 kg. A spring connected them which goes over a massless pulley A. There is no friction between pulley and string A. Find acceleration of centre of mass of the system of two masses (in `m//s^(2)`

A

1/3 `m//s^(2)`

B

2/3 `m//s^(2)`

C

1 `m//s^(2)`

D

1/5 `m//s^(2)`

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