The speed is the slope of the distance versus time graph.
To do Q15 first, the greatest speed is the steepest slope, line A.
Two points on A are (2,10) and (0,0) so a slope, i.e. a speed of 10/2=5 meters per second
In detail, the slope is rise over run:
[tex]\textrm{slope}= \dfrac{\textrm{change in y}}{\textrm{change in x}}=\dfrac{10-0}{2-0} =5[/tex]
Q14 Answer: 5
