Air rushing over the wings of high-performance race cars generates unwanted horizontal air resistance but also causes a vertical down force, which helps the cars hug the track more securely. The coefficient of static friction between the track and the tires of a 690-kg race car is 0.87. What is the magnitude of the maximum acceleration at which the car can speed up without its tires slipping when a 4060-N down force and an 1190-N horizontal-air-resistance force act on it?