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A 13m long ladder is leaning against a wall. The top of the ladder is sliding down the wall at a constant speed of

  

A 13m long ladder is leaning against a wall. The top of the ladder is sliding down the wall at a constant speed of 5m/s. How quickly is the bottom of the ladder moving away from the wall when the top of the ladder is 4m from the ground? Give your answer as an exact expression. Worksheet Speed = m/s

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