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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

0.75

b

0.43

c

0.58

d

0.83

answer is B.

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Detailed Solution

$Fcos θ = f_{k}, f_{k} = μ_{k} N, N = mg - Fsin θ$

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