The distance it takes an automobile to stop varies directly as the square of its speed. If
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The distance it takes an automobile to stop varies directly as the square of its speed. If the stopping distance of a car traveling at 40 mph is 320 feet, what is the stopping distance of a car traveling at 50mph?
A) 360 ft
B) 420 ft
C) 500 ft
D) 580 ft
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