A block of mass $M$ is being pulled along rough horizontal surface. The coefficient of friction between the block and the surface is $\mu $. If another block of mass $M/2$ is placed on the block and it is again pulled on the surface, the coefficient of friction between the block and the surface will be

  • A

    $\mu $

  • B

    $3\mu /2$

  • C

    $2\mu $

  • D

    $5\mu /2$

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