A weightless ladder 20 ft long rests against a frictionless wall at an angle of...

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A weightless ladder 20 ft long rests against a frictionless wall at an angle of 60 with the horizontal A 150 pound man is 4 ft from the top of the ladder A horizontal force is needed to prevent it from slipping Choose the correct magnitude from the following a 175 lb b 100 lb d 150 lb c 70 lb

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