A 15.0 -m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 60.0^∘ angle with the horizontal. (a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when an 800 -N firefighter has climbed 4.00 m along the ladder from the bottom. (b) If the ladder is just on the verge of slipping when the firefighter is 9.00 m from the bottom, what is the coefficient of static friction between ladder and ground? | Numerade
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