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A ladder 26 ft long leans against a vert...

A ladder 26 ft long leans against a vertical wall. If the top slides downwards at the rate of 10 in/s. find the rate at which the lower end moves on a horizontal floor when it is 10 ft from the wall. Find also the rate at which the slope of the ladder changes.

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The correct Answer is:
2 ft/s and`(-(169)/(300))`per second
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