The position of an object moving along a line is given by the function s(t) = 4t2 +40t. Find the average velocity of the object over the following intervals. (at) [1, 8] lb] [1, 7] (c) [1, 6] [d] [1, 1 + h] where h > 0 is any real number. (a) The average velocity of the object over the interval [1, 8] is (b) The average velocity of the object over the interval [1, 7] is (c) The average velocity of the object over the interval [1, 6] is (d) The average velocity of the object over the intenral [1, 1 + h] is