l. (8 points) Suppose that the position of a particle moving along a straight line is given by, where s is l 5 . . . 3(5) = 5:3 5:2 + 4: +8 measured In meters and 2' 15 measured in seconds, I 2 0. (a) Find the velocity and acceleration mctions for the object. (b) When is the object moving in the positive direction? Write your answer using interval notation. (c) When is the object slowing down? Write your answer using interval notation. (d) What is the average speed of the object over the rst 3 seconds