The angular position of a point on the rim of a rotating wheel is given by θ = 4.0t - 3.0t2+ t3, where θ is in radian and t is in seconds. What are the angular velocities at?

(a) T = 2.0 s and

(b) T = 4.0 s?

(c) What is the average angular acceleration for the time interval that begins at t = 2.0 s and ends at t = 4.0 s? What are the instantaneous angular accelerations at?

(d) The beginning and

(e) The end of this time interval?