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Q.

A 20 kg block is in motion on a rough horizontal surface A horizontal force of 60 N is required to keep the body moving with constant speed. The coefficient of kinetic friction is $(g = 10 {ms}^{- 2})$

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a

0.2

b

0.3

c

0.4

d

0.5

answer is A.

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Detailed Solution

μ_{s} = \frac{F_{l}}{R}

$= \frac{75}{mg} = \frac{75}{20×9 .8} =0 .38$

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