The Coefficient of Static Friction for the Tires of a Race

Multiple Choice

The coefficient of static friction for the tires of a race car is 0.950 and the coefficient of kinetic friction is 0.800.The car is on a level circular track of 50.0 m radius on a planet where
Compared to Earth's
) If the car is to be able to travel at the same speed on the planet as on Earth,the radius of the track on the planet must be ____ times as large as the radius of the track on Earth.

A) 0.250
B) 0.500
C) 1.00
D) 2.00
E) 4.00