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A block of mass m is connected with anot...

A block of mass m is connected with another block of mass 2m kept on a rough horizontal table by means of an ideal spring of spring constant K and a massless string as shown in the figure. The minimum coefficient of friction between the block of mass `2m` and the table so that the block does not slide, when block of mass m is suddenly released, is

A

`1/4`

B

`1/2`

C

`1`

D

`3/4`

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