4-54. The spool has a mass of 200 kg and rests against the wall and on the floor. If the coefficient of static friction at B is (4)e = 0.3, the coefficient of kinetic friction is (He)B = 0.2, and the wall is smooth, determine the friction force developed at B when the vertical force applied to the cable is P= 80 N. 0.4 m 0.1 m

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