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

A ladder 5 m 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 m away from the wall ?

A

`1/10 radian //sec`

B

`1/20 radian //sec`

C

`20 radian //sec`

D

`10 radian//sec`

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