A block of mass $0.1 \,kg$ is held against a wall by applying a horizontal force of $5\, N$ on the block. If the coefficient of friction between the block and the wall is $0.5$, the magnitude of the frictional force acting on the block is ........ $N$

  • [IIT 1994]
  • A

    $2.5$

  • B

    $0.98 $

  • C

    $4.9$

  • D

    $0.49$

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