Application of DerivativeEasy
Question
A stone is dropped into a quiet lake and waves move in a circle at a speed of 3.5 cm/sec. At the instant when the radius of the circular wave is 7.5 cm, The enclosed area increases as fastly as -
Options
A.52.5 π cm2/sec
B.50.5 π cm2/sec
C.57.5 π cm2/sec
D.62.5 π cm2/sec
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