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A horizontal force of $10 \mathrm{~N}$ is necessary to just hold a block stationary against a wall. The co-efficient of friction between the block and the wall is $0.2$. The weight of the block is
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$2 \mathrm{~N}$
$2 \mathrm{~N}$
$\mathrm{f}=\mathrm{mg} \Rightarrow \mu \mathrm{N}=\mathrm{W} \Rightarrow \mu .10=\mathrm{W}$
$\Rightarrow 0.2 \times 10=\mathrm{W}$
$\therefore \mathrm{W}=2 \mathrm{~N}$
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