A car traveling 50 m/s has tires tires that with radii of 0.25 m. The driver of the car hits the brakes and brings the car to a stop in 5 seconds. What is the angular acceleration of the tires on the car?

Answer 1

a = (0-50) / 5 = -10m/s^2.

C = pi*D = 3.14 * (2*0.25) = 1.57m/rev.

V=10m/S^2 * (1/1.57)rev/m * 6.28rad/rev
= 40rad/s^2.