The angular position of a wheel is given by θ=4t2−t3, where θ is in radians and t in seconds. Which pair gives (instantaneous angular velocity at t=2s, average angular velocity between t=0 and t=2s)?
a) (12rad s−1,4rad s−1)
b) (4rad s−1,4rad s−1)
c) (4rad s−1,8rad s−1)
d) (−4rad s−1,4rad s−1)