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A ladder 5 m long is leaning against a w...

A ladder 5 m long is leaning against a well. The bottom of the ladder is pulled along the ground, away from the well, at the rate of 2 m/s. How fat is its height on the wall decreasing when the foot of the ladder is 4m away from the wall?

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The correct Answer is:
`8/3 cm//s`.
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