This diagram shows a speed-time graph for a Speed versus Time low-friction cart that was moving along four 120 segments of track. For this situation assume 100 the effects of friction are so small that you III 80 can ignore them. The graph consists of four 60 Speed (cmic] straight-line segments labeled I through IV Along each segment the cart was either involved in a single interaction or was not 20 IV involved in any interactions. 05 1.0 1.5 2.0 2.5 Time (s)