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A 15 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 2 ft/s, how fast

A 15 foot ladder is leaning against a wall. If the top slips down the wall at a rate of 2 ft/s, how fast will the foot be moving away from the wall when the top is 13 feet above the ground? The foot will be moving at ft/s.

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