If mass of $A = 10\,\,kg$, coefficient of static friction $= 0.2$, coefficient of kinetic friction = $0.2$. Then mass of $B$ to start motion is

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  • A

    $2\, kg$

  • B

    $2.2\, kg$

  • C

    $4.8\, kg$

  • D

    $200\, gm$

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  • [AIIMS 2001]

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$(a)$ At what angle of inclination $\theta $ of the plane to the horizontal will the box just start to slide down the plane ?

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$(c)$ What is the force needed to be applied upwards along the plane to make the box either remain stationary or just move up with uniform speed ?

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