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A ladder 5 meter long rest on a horizontal ground and leans against a smooth vertical wall at an angle 70 with the horizontal.

A ladder 5 meter long rest on a horizontal ground and leans against a smooth vertical wall at an angle 70 with the horizontal. The weight of the ladder is 950 N and acts at its middle. The ladder is at the verge of sliding. When a man weighing 750 N stands on a rung 1.5 meter from the bottom of the ladder. The coefficient of friction between the ladder and the floor is A 1.5 m B 70 750 N

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