Aspeed-time graph is shown below:

a speed versus time graph is shown with y-axis labeled position in centimeters per second up to 5 and x-axis labeled time in seconds up to 8. a straight line connects the points 0, 0 and 4, 4. a horizontal line connects points 4, 4 and 8, 4.

what is the average acceleration of the object represented in the graph above over the eight seconds?

0.5 cm/s2
1.0 cm/s2
1.5 cm/s2
2.0 cm/s2