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