The beam AB has a negligible mass and thickness and is subjected to a uniformly distributed loading. It is supported at one end by a pin at A and at the other end by the post BC. The post mass is having a mass of 100 kg and negligible thickness. Determine the two coefficients of static friction at B and at C so that when the magnitude of the applied force is increased to P= 200 kN, the post slips at both B and C simultaneously.