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A 52.5 kg, 3 m uniform ladder leans against a frictionless wall. A 93.9 kg person...

A 52.5 kg, 3 m uniform ladder leans against a frictionless wall. A 93.9 kg person is standing on the ladder down 1.14 m from the top of the ladder. The ladder makes an angle of 60 degrees with the horizontal. What is the minimum coefficient of static friction between the ladder and the ground so that the ladder does not slip?

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