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10. A ladder 15 m long leans against the wall. The ladder slides down the wall at a rate of 1.5 m/s. What is the

10. A ladder 15 m long leans against the wall. The ladder slides down the wall at a rate of 1.5 m/s. What is the rate of change of the angle at the ground when the ladder is 6 m from the wall? (3 marks)

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