3. The figure shows the position vs. time graphs of two objects A and B moving along x-axis for 5 seconds. +x (m) 20 (a) (5 points) Are object A and B moving B along a straight line? Explain? (Note 15 - explanation is worth 3 points.) 10 5 4 5 t(s) (b) (5 points) Compute the average velocity of Ajand B between 2s and 4s. Note that average velocity is displacement over time. So average velocity is also the slope of line segment connecting two times of interest. Show your work including the line segment of the graph of A