A block of mass $m$ is stationary on a rough plane of mass $M$ inclined at an angle $\theta$ to the horizontal, while the whole set up is accelerating upwards at an acceleration $\alpha$. If the coefficient of friction between the block and the plane is $\mu$, then the force that the plane exerts on the block is

  • [KVPY 2009]
  • A

    $m(g+a)$ upwards

  • B

    $m g \cos \theta$ normal to the plane

  • C

    resultant of $m g \cos \theta$ normal to the plane and $\mu m g \cos \theta$ along the plane

  • D

    resultant of $m(g+a) \cos \theta$ normal to the plane and $\mu m g \cos \theta$ along the plane

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