When a cyclist turns on a circular path,the necessary centripetal force is provided by friction between the tyres and the road. If centripetal force is not provided by friction, then for the vehicle to move on circular path, the track is banked.
If the speed of a vehicle is doubled, then for safety of vehicle

Options

A. the angle of banking must be doubled
B. the angle of banking must be four times
C. the tangent of angle of banking must be doubled
D. the tangent of angle of banking must be increased to four times.

Answer

D