Answer the following questions using the graph at right, which shows the velocity of a runner over time. The letters $A$ and $B$ represent the areas of the two regions in the diagram.

1. Describe the motion of the runner during the time that is illustrated in the graph.

   Hint (a):

   Include information about the direction that the runner was moving.

2. What is the significance of point $p$?

   Hint (b):

   How does the runner's motion change when she/he reaches point $p$?

3. What does the area $A$ represent in this situation? That is, what does it tell you about the runner? What about area $B$?

   Hint (c):

   What does area under a velocity curve represent?

4. If $A = 30$ meters and $B =-5$ meters, what does $A + B$ represent in this situation? Why is $B$ negative?

   Hint (d):

   Compare and contrast 'displacement' with 'total distance.'