Question: A horizontal floor at bottom end A and a vertical wall at top end B support a uniform ladder AB that weighs 1 9 0

A horizontal floor at bottom end A and a vertical wall at top end B support a uniform ladder AB that weighs 190N and is 4 meters long. At the top of the ladder stood a man who weighed 430N. For ladder stability, find the minimal angle that ladder AB must have with floors. Consider the coefficients of friction of 1/3 and 1/4, respectively, between the ladder and the wall and the floor.

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