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A block of $1 \mathrm{~kg}$ is stopped against a wall by applying a force $F$ perpendicular to the wall. If $\mu=0.2$ then minimum value of $F$ will be
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$49 \mathrm{~N}$
$F=\frac{W}{\mu}=\frac{1 \times 9.8}{0.2}=49 \mathrm{~N}$
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