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A horizontal force of 10 N is necessary ...

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. the weight of the block is `(g=10 m//s^(2))`

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For horizontal balance R=10N
and for vertical balance of the block `mg=muR=0.2xx10`
`rArrm=0.2kg rArr "weight"=mg=0.2xx10=2N`
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