A uniform ladder of mass m = 3.0 kg and length L = 2.5 m leans against a smooth (frictionless) wall. The ladder leans so that it makes an angle θ with the rough floor on which it rests. The coefficient of static friction between the floor and the ladder is μs=0.85. With the aid of free body diagram, how small can θ be before the ladder will begin to slide?

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