Air rushing over the wings of high-performance race cars generates unwanted horizontal air resistance but also causes a vertical downforce, which cars hug the track more securely. the coefficient of static friction between the track and the tires of a 678-kg car is 0.843. what is the magnitude of the maximum acceleration at which the car can speed up without its tires slipping when a 3620-n downforce and an 1270-n horizontal air resistance force act on it?