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A book of weight `20N` is pressed between two hands and each hand exerts a force of `40N`. If the block just starts to slide down Coefficient of frict

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A book of weight `20N` is pressed between two hands and each hand exerts a force of `40N`. If the block just starts to slide down Coefficient of friction is .
A. `0.25`
B. `0.2`
C. `0.5`
D. `0.1`
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1 Answer

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Correct Answer - A
`f_(s) = mu_(s) N ,mu = (f_(s))/(N) = (mg)/(2F)`
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