Investigators at a traffic accident used the function  d(v) = 0.04v2 + 0.8v,  where v is the velocity of the car (in mph) and d(v) is the stopping distance of the car (in feet), to reconstruct the events leading up to a collision. From physical evidence, it was concluded that it took one car 192 feet to stop. At what velocity was the car traveling prior to the accident? v =  mph

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A: topic - average rate of change of function over interval

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