A position versus time graph is shown below. A Position versus Time graph is shown with y-axis labeled position in meters north up to 20 and x-axis labeled time in seconds up to 10. A line connects points 0, 0 and 1, 4. A horizontal line connects points 1, 4 and 4, 4. A line connects points 4, 4 and 6, 10. A horizontal line connects points 6, 10 and 8, 10. A line connects 8, 10 and 9, 14, and then 10, 15.

Use the graph to determine the average velocity in m/s of the object at the end of 4.0 seconds? (2 points)

a
1 m/s

b
2 m/s

c
4 m/s

d
5 m/s

PLEASE ANSWER QUICK THE TEST IS TIMED