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Q.

A block of weight 200N is pulled along a rough horizontal surface at constant speed by a force of 100N acting at an angle 30º above the horizontal. The coefficient of kinetic friction between the block and the surface is

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a

0.43

b

0.58

c

0.75

d

0.83

answer is B.

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Detailed Solution

Fcos⁡θ=fk,fk=μkN,N=mg−Fsin⁡θ
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