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A ladder 5 cm long is leaning against a ...

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

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The correct Answer is:
`(8)/(3)` cm/sec.
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