A Car Traveling 20 M/s Rounds an 80 M Radius

Multiple Choice

A car traveling 20 m/s rounds an 80 m radius horizontal curve with the tires on the verge of slipping. How fast can this car round a second curve of radius 320 m? (Assume the same coefficient of friction between the car's tires and each road surface.)

A) 70 m/s
B) 40 m/s
C) 30 m/s
D) 80 m/s
E) 1.6 × 10² m/s