a car travels at 80 km/h on a level road in the positive direction of an x axis. each tire has a diameter of 66 cm. relative to a woman riding in the car and in unit-vector notation, what are the velocity at the (a) center, (b) top, and (c) bottom of the tire and the magnitude a of the acceleration at the (d) center, (e) top, and (f) bottom of each tire? relative to a