1. The problem statement, all variables and given/known data Find the body's displacement and average velocity for the given time interval. s=t^2 -3t +2, 0<=t<=2 2. Relevant equations d(displacement)/d(time) is for the acceleration right? 3. The attempt at a solution So here is my problem. I got 2t-3 for the derivative, but i don't really know how to apply it to the question. I feel like i need just one value for t in order to find the displacement and velocity at that point, right? So how do i incorporate a full interval, 0 to 2? The back of the book says -2 for displacement and -1 for acceleration, but i have no clue how that is the case when you have multiple values of t. I would have just said the 2t-3.