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A car moving around a circular track at a speed of 20mph requires the frictional force between its tires and the ground to be 500

A car moving around a circular track at a speed of 20mph requires the frictional force between its tires and the ground to be 500 pounds. What is the value and units of the proportionality constant. What is the equation that relates the two variables F, v^2 using an unknown constant K . If a car's speed is 15mph what is the value of the force

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