1. The problem statement, all variables and given/known data The position v. time graph for a certain object moving along the x-axis is shown. I don't have the graph. Bu I have the points. (0,-2), (1,9), (4,4), (6,4), (8,-4), (9,0) The object's initial position is -2m. Find the instantaneous velocity at .... (m/s) a.) 0.5s b.) 2.5s c.) 5 s d.) 8.5 s 2. Relevant equations I think .... Instantaneous Velocity = (Xf - Xi) / (Tf - Ti) 3. The attempt at a solution Well, I really don't understand where to start. Looking at the graph, for 0.5 sec ... I put 4. That was incorrect. I put in (4-(-2)) / (0.5 - 0) = 6/0.5 = 12. That's incorrect as well. I think I really don't understand the correct thing to do. If someone could give me some guidance or direction as how to tackle this I'd appreciate it. Thanks in advance!