In the arrangement shown in the figure, ...

In the arrangement shown in the figure, mass of the block B and A is 2m and m respectively. Surface between B and floor is smooth. The block B is connected to the block C by means of a string-pulley system. If the whole system is released, then find the minimum value of mass of block C so that A remains stationary w.e.t. B. Coefficient of friction between A and B is `mu.`

`(m)/(mu)`

`(2m+1)/(mu+1)`

`(3m)/(mu-1)`

`(6m)/(mu+1)`

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