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A block of mass m is kept over another b...

A block of mass m is kept over another block of mass 2m. Coefficient of friction between two blocks is `mu` and that of between lower blood from the horizontal surface is zero. A horizontal force `F=4/3 mu mg` is applied on the block of mass `2m`. Acceleration of lower block is

A

`mu g`

B

`(mu g)/2`

C

`(2mu g)/9`

D

`(4mu g)/9`

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