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A block of mass m is placed on an inclined plane and angle of inclination is increasing with respect to time. Coefficient of friction is 3/4, which of the following is incorrect?
(1) When body is at rest N+f+mg=0
(2)f=mgsinθ when θ<37°
(3)f=μmgcosθ when θ>=37°
(4)When body is at rest Ncosθ=mg
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