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A car goes around a flat curve of radius 50 m at a speed of 14 m/s without slipping. Which of the following statements, regarding friction between the tires and the road, is correct?
a. coefficient of static friction is 0.40 or greater
b. coefficient of static friction is 0.40 or smaller
c. coefficient of kinetic friction is 0.40 or greater
d. coefficient of kinetic friction is 0.40 or smaller
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v^2 / (rg) = 14^2 / (50*9.8) = 0.4

c. coefficient of kinetic friction is 0.40 or greater
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