The crate, which has a mass of 140 kg, is subjected to the action of the three forces shown in the figure. If it is originally at rest, determine the friction force when P1 = 750 N, P, = 900 N, P3 = 500 N and 0 = %3! %3! 25°. Assume the coefficient of kinetic friction between the crate and the surface is Hk = 0.40. %3! P2 P1 P3

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