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. a. Determine the coefficient of static friction b. 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 as in part a. (Hint: if you solve symbolically for part a, then you can use your symbolic solution for part a to find this without redoing everything)