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

A stone is dropped into a quiet pond and waves spread in the form of concentric circles outward from the point where it strikes at speed of 4 inch /sec. When the radius of the wave- ring is 3 ft , the enclosed area is increasing at the rate of

A

`2 pi sq. ft. // sec`.

B

` pi sq. ft // sec`.

C

` 3 pi sq. ft. // sec `.

D

` 4 pi sq. ft // sec.`

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A
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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