The position of an object moving vertically along a line is given by the function s(l.) = - 4.9[2 + 34t + 1?. Find the average velocity of the object over the following intervals. a. [0,4] I}. [6,73 :3. [0,81 d. [Uh], where h 2' {J is a real number <: a. the average velocity is your answer. b. e. c.the velocilv d.>