Consider the following graphs:
What interesting questions or comments could be made based on these?
For me, there is a ton of wealth by just posting each of these on the board and having the class discuss each one. Having a conversation on whether the graphs represent two people or two different times the trip was made is interesting for students (and they will have definite opinions on which is right!)
This is what it looks like when I show you the handout that I found this in:
How much is lost by presenting this to the students?
(Give me some input, and I will follow up with how it went today when I gave one class the sheet, and only presented graphs for the second class)