A bicycle tire is spinning counterclockwise at 2.40 rad/s. During a time period At = 1.10 s, the tire is stopped and spun in the opposite (clockwise) direction, also at 2.40 rad/s. Calculate the change in the tire's angular velocity Aw and the tire's average angular acceleration day. (Indicate the direction with the signs of your answers.) (a) the change in the tire's angular velocity Aw (in rad/s) rad/s (b) the tire's average angular acceleration @av (in rad/s) rad/s