A motorcycle, which has an initial linear speed of 6.4 m/s, decelerates to a speed of 1.5 m/s in 5.7 s. Each wheel has a radius of 0.60 m and is rotating in a counterclockwise (positive) directions. What is
(a) the constant angular acceleration (in rad/s2) and
(b) the angular displacement (in rad) of each wheel?