A car initial velocity is 5m/s and final velocity is 10m/s. Find the average velocity of the car.  

Initial velocity (u) = $5 m{s}^{-1}$

Final velocity (v) = $10 m{s}^{-1}$

Total time = $2 sec$

$$\begin{gathered} avg. velocity = \frac{u+v}{time} \\ avg. velocity = \frac{5+10}{2} \\ avg. velocity = 7.5 m{s}^{-1} \end{gathered}$$