16. The graph to the right shows the position, s(t) , in meters of an object after t seconds. 'y (M) a. Find the average velocity from t= 0 to t= l. b. Estimate the interval(s) where the velocity is positive. 0. Estimate the interval(s) where the acceleration is positive. 17. A particle moves along a straight line with equation of motion 50') = 1+ 21' + tz , where S is measured in meters and t is measured in seconds. a. Find a formula for the velocity, v(t) , as a function of t