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While a car was operated at 60 mph on a freeway, the driver saw a box...

While a car was operated at 60 mph on a freeway, the driver saw a box on the road ahead and tried to stop the car. The highway grade is -2%. Assume the maximum deceleration rate of the car is 11.2 ft/sec^2 and the perception-reaction time is 2.5 sec. Calculate the stopping sight distance.

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