a)
The average velocity of an object is given by:
[tex]\begin{gathered} v=\frac{\Delta x}{t} \\ \text{ where }\Delta x\text{ is the displacement and }t\text{ is the time } \end{gathered}[/tex]In this case we know the displacement is 324 km and the time is 2 h, then we have:
[tex]\begin{gathered} v=\frac{324}{2} \\ v=162 \end{gathered}[/tex]Therefore, the average velocity of the plane is 162 km/h
b)
We know that the plane is flying at constant speed, this means that its average velocity and instantaneous velocity are equal, therefore, the instantaneous velocity is 162 km/h.
