The position in feet of a race car along a straight track after t seconds is modeled by the function s (t) = 8t2 -t3. 16 Find the average velocity of the vehicle over the following time intervals to four decimal places: i. [4, 4.1] ii. [4, 4.01] iii. [4, 4.001] iv. [4, 4.0001] a. Use a. to draw a conclusion about the instantaneous velocity of the vehicle at t = 4 seconds. b.