The position of an object moving vertically along a line is given by the function s(t) = - 4.912 + 271+ 16. Find the average velocity of the object over the following intervals. a. [0,3] b. [0,6] c. [0,7] d. [0,h], where h > 0 is a real number a. The average velocity is (Simplify your answer.) b. The average velocity is (Simplify your answer.) c. The average velocity is (Simplify your answer.) d. The average velocity is