10. A car is traveling on a flat circular track of radius 200 m at 20 m s' and has a centripetal acceleration a = 4.5 m/s2 (a) If the mass of the car is 1000 kg, what frictional force is required to provide the acceleration? (b) If the coefficient of static friction is 0.8, what is the maximum speed at which the car can circle the track?
