An 810 kg race car can drive around an unbanked turn at amaximum speed of 60 m/s without slipping. The turn has aradius curvature of 150 m. Air flowing over the car's wing exerts adownward-pointing force (called the downforce) of 11500 N on the car. A) What is the coefficient of static friction between the track and the car's tires? B) What would be the maximum speed if no downforce acted on the car?