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Mathematics 21 Online
OpenStudy (anonymous):

The force needed to keep a car from skidding on a curve varies inversely with the radius of the curve and jointly with the weight of the car and the square of the speed. If 3900 pounds of force keeps a 3510 pound car from skidding as it travels at 25 miles per hour on a curve of radius 500 feet, what force would keep the car from skidding on a curve of radius 900 feet at 45 miles per hour?

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