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

  • 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 $\mu m(g+a) \cos \theta$ along the plane

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