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A 13-m long ladder is leaning against a ...

A 13-m long ladder is leaning against a wall. The bottom of the ladder is pulled along the ground, away from the wall, at the rate of 2 m/s. How fast is its height on the wall decreasing when the foot of the ladder is 5m aways from the wall ?

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The correct Answer is:
`(5)/(6)m//s.`
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