Uniform Circular Motion: A car traveling at a steady 20 m/s rounds an 80-m radius horizontal unbanked curve with the tires on the verge of slipping. What is the maximum speed with which this car can round a second unbanked curve of radius 320 m if the coefficient of static friction between the car's tires and the road surface is the same in both cases?
A. 160 m/s
B. 80 m/s
C. 70 m/s
D. 40 m/s
E. 30 m/s
Answer: D
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