A conveyor belt is moving at a constant speed of $2\, m s^{-1}$. A box is gently dropped on it. The coefficient of friction between them is $\mu  = 0.5.$ The distance that the box will move relative to belt before coming to rest on it, taking $g = 10\, m s^{-2},$ is   ........... $m$

  • [AIPMT 2011]
  • A

    $0.4 $

  • B

    $1.2 $

  • C

    $0.6$

  • D

    $0$

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  • [AIPMT 1992]