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4. A ladder 5 m long has a mass of 18 kg and its center of...

4. A ladder 5 m long has a mass of 18 kg and its center of gravity is 2.5 m from the bottom. The ladder is placed against a vertical wall so that it makes an angle of 60° with the ground. How far up the ladder can a 70 kg man climb before the ladder is on the verge of slipping? The angle of friction at all contact surfaces is 16°.

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