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A ladder 5 m in length is resting agains...

A ladder 5 m in length is resting against vertical wall. The bottom of the ladder is pulled along the ground away from the wall at the rate of 1.5m/sec. The length of the highest point of the ladder when the foot of the ladder 4.0 m away from the wall decreases at the rate of

A

`2m//sec`

B

`3m//sec`

C

`2.5m//sec`

D

`1.5m//sec`

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The correct Answer is:
A
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