3.4.1 Questic A body moves on a coordinate line such that it has a position s = f(t) = 12 - 31+2 on the interval Osts 9, with sin meters and in seconds a Find the body's displacement and average velocity for the given time interval b. Find the body's speed and acceleration at the endpoints of the interval c When if ever during the interval does the body change direction? The body's displacement for the given time interval is m Type an integer or a simplified fraction)