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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
  • A$m(g+a)$ upwards
  • B$m g \cos \theta$ normal to the plane
  • Cresultant of $m g \cos \theta$ normal to the plane and $\mu m g \cos \theta$ along the plane
  • Dresultant of $m(g+a) \cos \theta$ normal to the plane and $\mu m g \cos \theta$ along the plane
KVPY 2009, Diffcult
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