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 ........ $N$
  • A$2.5$
  • B$0.98 $
  • C$4.9$
  • D$0.49$
IIT 1994, Medium
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