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A stone is dropped into a quiet lake and...

A stone is dropped into a quiet lake and waves in circles at the speed of 5 cm/s. At the instant when the radius of the circular wave is 8 cm, how fast is the enclosed area increasing?

A

`6 pi cm^(2)//s`

B

`8 pi cm^(2)//s`

C

`8/3 cm^(2)//s`

D

`80pi cm^(2)//s`

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The correct Answer is:
D
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