Circular Freeway Entrance and Exit Ramps Are Commonly Banked to Handle

Multiple Choice

Circular freeway entrance and exit ramps are commonly banked to handle a car moving at 13 m/s. To design a similar ramp for 26 m/s one should:

A) increase radius by factor of 2
B) decrease radius by factor of 2
C) increase radius by factor of 4
D) decrease radius by factor of 4
E)