CK-12-Physics - Intermediate

2.2. Speed and Velocity in One Dimension http://www.ck12.org

FIGURE 2.9

2. The motion of a rolling marble is represented in the position-time graph inFigure2.9. Write a sentence or
   two that describes its motion.
   Answers: During the first five seconds the marble rolls to the right, slowly. During the next five seconds, it
   continues rolling to the right but faster. During the next five seconds, the marble rolls to the left a bit slower
   than during the previous five seconds. During the last five seconds, the marble is stationary.

http://demonstrations.wolfram.com/LinearMotion/