Position of the car at t1=5 sec is x1=0.8 km (from graph).
Position of the car at t2=10 sec is x2=1 km (from graph).
The distance travel by the car between time interval 5 sec to 10 is given as,
[tex]\begin{gathered} d=x_2-x_1 \\ =1\text{ km}-0.8\text{ km} \\ =0.2\text{ km} \end{gathered}[/tex]
The average speed of the car between the time interval 5 sec to 10 sec is given as,
[tex]\begin{gathered} v_{avg}=\frac{x_2-x_1}{t_2-t_1} \\ =\frac{1\text{ km}-0.8\text{ km}}{10\text{ sec}-5\text{ sec}} \\ =0.04\text{ km/s} \end{gathered}[/tex]
Therefore, the average speed of the car between the time interval 5 and 10 sec is 0.04 km/s.
