For an 8 s interval, an object’s velocity–time graph is described as follows:
• From t = 0 s to t = 2 s the velocity is constant at +4 m/s.
• From t = 2 s to t = 6 s the velocity decreases uniformly to –4 m/s.
• From t = 6 s to t = 8 s the velocity remains constant at –4 m/s.
What is the object’s average velocity over the entire 8 s interval?
a) +2m/s
b) 0m/s
c) −1m/s
d) +1m/s