A position-time graph is shown.

Graph of position versus time with time on the x axis in seconds and position on the y axis in meters. The graph starts at 0, 0 and then curves through 1, 4 and then 2, 5.5 and then 3, 6.5 and then 4, 6.7.

Calculate the slope of the line segment from t = 2 s to t = 3 s.

1.0 m/s
2.2 m/s
2.8 m/s
6.5 m/s