a. Q: Find the acceleration between 0s and 4s. A: vf= 10m/s vi=0m/s a = vf - vi / t = (10m/s - 0m/s) / 4s = 10 m/s / 4 s = 2.5 m/s^2 b. Q: Find the acceleration at 8s. A: a = v/t = (6.5m/s)(8s) = 52 m/s = 50 m/s^2 (significant digits?) PS. The line is going down, but the velocity is still in the postive x-axis. How do I represent that it is going in the opposite direction? c. Q: Find the acceleration at 5s A: a = v/t = (10m/s)(5s) = 50 m/s^2 d. Q: Find the average velocity for this trip. (Hint: First find the total displacement) A: Do I have to find the displacement for each section of the graph?, and add it together for total displacement, then divide it by 20s (total time), to find the average velocity?