How fast is the top of the ladder sliding down the wall


A 10?-foot ladder is placed against a vertical wall. Suppose the bottom of the ladder slides away from the wall at a constant rate of 4 feet per second. How fast is the top of the ladder sliding down the wall? (negative rate) when the bottom is 8 feet from the? wall?

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Mathematics: How fast is the top of the ladder sliding down the wall
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