(1 point) Suppose that an object moves along an s-axis so that its location is given by s(t) = t + 6t at time t. (Here s is in meters and t is in seconds.) (a) Find the average velocity of the object in meters per second over the time interval t = 1 tot = 9 seconds. (Include units) Average velocity = (b) Find the instantaneous velocity of the object in meters per second at t = 6 seconds. Instantaneous velocity =