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A stone is dropped into a pond. Waves in...

A stone is dropped into a pond. Waves in the form of circles are generated and the radius of the outermost ripple increases at the rate of 2 inches/sec. If the radius is 5 inches, then the rate at which the area increasing, is

A

`20 pi" inches"^(2)//sec`

B

`40pi" inches"^(2)//sec`

C

`5pi" inches"^(2)//sec`

D

`10pi" inches"^(2)//sec`

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The correct Answer is:
A
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