A body of mass $2 \,kg$ is kept by pressing to a vertical wall by a force of $100\, N$. The coefficient of friction between wall and body is $0.3.$ Then the frictional force is equal to ........ $N$
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(b) For the given condition,
Static friction = Applied force = Weight of body
$ = 2 \times 10 = 20\;N$
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