A 583 m long ladder with mass 231 kg rests against a smooth, Ask an Expert

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A 5.83 m long ladder with mass 23.1 kg rests against a smooth wall. The ladder makes an angle of 66.7 degrees with the ground. A person with mass 81.6 kg has climbed 2/3 of the way to the top of the ladder. Find the force of friction between the ladder and the ground.

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