A stone is dropped into a quite lake and waves moves in circles spreading out radially at the speed of 0.2m/s. At the instant when the radius of the circular wave is 4 p m, how fast is the enclosed area increasing ? (1) 4 m2 / s p (2) 1.6 m2 / s (3) 2m2 / s (4) 1 2 / 2 m
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The answer of this is 2m/s...
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