Question: Find the average velocity over the time interval from 1 to 5 seconds. You will need to interpolate to find the position at time t=5 s . Do not simply eyeball the position or you will likely not be able to obtain the solution to the desired accuracy. (Referring to attached graph: link http://i11.tinypic.com/6g4jl8i.jpg) How do you find the Average Velocity in a time interval of a position vs time graph when the position rises then decreases? some info from previous questions and work i did is as follows: velocity from t=1 to t=3 is 20 m/s position at t=5 is about 46.7 m velocity from t=4.5 to t=4.5 is (i think) about -26.7 m/s I tried a few times and got answers like 4.2 trying to average the time the velocity took in each part but it didnt work. The question says to interpolate, but apparently i dont know how to do that the right way since im gettin it wrong. any ideas?