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If an airplane is moving at velocity v , the drag D (in N ) on the plane is D = av 2 + b/

If an airplane is moving at velocity v , the drag D (in N ) on the plane is D = av² + b/ v² , where a = 5.3010^-3and b = 3.0510⁸. Find the value(s) of v (in km/h), for which the drag is the least. Round the answer to one decimal place.

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