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A uniform ladder of length 5m weighing 200N leans against a frictionless vertical wall. The foot of the ladder is placed 3M away from the

A uniform ladder of length 5m weighing 200N leans against a frictionless vertical wall. The foot of the ladder is placed 3M away from the wall on the ground. What must be the magnitude of static friction be so that the ladder does not slip when Dr. Rob (100kg) climbs ½ way up the ladder?

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