Physics

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The angular position of a point on the rim of a rotating wheel is given by è = 8.0t - 3.0t2 + t3, where è is in radians and t is in seconds.
(a) What is the angular velocity at t = 5 s?
___________rad/s

(b)What is the angular velocity at t = 7.0 s?
_________rad/s

(c) What is the average angular acceleration for the time interval that begins at t = 5 s and ends at t = 7.0 s?
_____________rad/s2

(d) What is the instantaneous angular acceleration at the beginning of this time interval?
_____________rad/s2

(e)What is the instantaneous angular acceleration at the end of this time interval?
_____________ rad/s2

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