Two blocks of same mass 'm' are connecte...

Two blocks of same mass 'm' are connected by the cable passing over a pulley of mass 'm' and radius 'R'. There is no slipping between the pulley and the cable. The coefficient of friction between the block 'A' and the horizontal surface is `1//4` . At the moment shown in the figure,the tension in the cable AB is

`(13)/(89) mg`

`(43)/(89)mg`

`(65)/(89)mg`

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