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A ladder, mass 40 kg, 5 m long, is leaning against a vertical frictionless wall at
an angle of 50egrees to the vertical. It is about to slip. What is the coefficient of friction on
the floor?

A man mass,80 kg,starts to climb up the ladder at 500. Measuring along the ladder
how far up can he go without the ladder collapsing? At what angle should he have placed
the ladder so that he could have climbed to the top before the ladder began to slide?

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