An 855 kilogram sports car can drive around an unbanked turn at a maximum speed of 60 m/s without slipping. The turn has a radius of curvature of 180 meter. Air flowing over the car's wing exerts a downward-pointing force (called the down force) of 2400 Newton on the car.
(a) Find the coefficient of static friction between track and car's tires?
(b) Find the maximum speed if no down force acted on the car?