A skateboarder’s velocity–time graph consists of two straight horizontal segments. For the first 4.0 s the velocity is +2.5 m/s, and for the next 4.0 s the velocity is –2.5 m/s. Which of the following statements is most accurate about the skateboarder’s motion during the entire 8.0 s interval?
(a) The total distance traveled is zero because the positive and negative velocities cancel.
(b) The average speed is zero because the velocities average to zero.
(c) The net displacement is zero because equal positive and negative areas cancel.
(d) The acceleration was zero throughout the 8.0 s interval because the velocity segments are horizontal.