A car of mass m = 2140kg drives on a horizontal, circular racetrack. The racetrack has a radius of r = 151.8m. The coefficient of static friction between the car's tires and the racetrack is ,u = 0.545. (The input below will accept answers with no more than 1% variation from the correct value.) The car travels at a constant speed Il = 20.6%. What is the magnitude of the friction force on the car? IFrI= N The car travels at IS I = 20.6% . What is the maximum possible instantaneous rate of change of the car's speed? Note that a component of acceleration along the direction of motion would produce a change in speed, and a component of acceleration perpendicular to motion would produce a change in direction of motion. S2