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Q.

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

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a

0.25

b

0.1

c

0.2

d

0.5

answer is A.

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Detailed Solution

The frictional force is equal to the weight of the book.

$2 f = mg \Rightarrow μ = \frac{mg}{2 N} = \frac{20}{2 x 40} = 0.25$

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