Block C has a mass of 50 kg and is confined between two walls by smooth rollers. If the block rests on top of the 40-kg spool, determine the minimum cable force P needed to move the spool. The cable is wrapped around the spool?s inner core. The coefficients of static friction at A and B are ?_A = 0.3 and ?_B = 0.6.

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0.4 m 0.2 m B. IKI