A ladder 5m long and 250 N weight is placed against a vertical wall in a position where its inclination to the vertical is 30°. A man weighing 800 N climbs the ladder. Sketch the ladder and determine at what position will the man induce slipping? The coefficient of friction for both the contact surfaces and the ladder is 0.2 (between the ladder and wall; and between the ladder and
floor). Assume the inclination of ladder and the floor is alpha.