Answer
$s_{avg}$=$\frac{8\ \rm km+8\ \rm km}{2\ \rm h}$=$\frac{16\ \rm km}{2\ \rm h}$
$s_{avg}$=$8\ \rm km/h$
$v_{avg}$=0
Work Step by Step
We know that average speed is equal to the total distance traveled, i.e. (8km+8km) divided by the total time taken, i.e (2h), which will give us 8km/h.
But the average velocity will be zero because the initial and the final points are the same because the jogger returns back to her starting point since velocity is the rate of change of displacement, and displacement will be zero as the jogger returns back to its starting point. The correct option will be (c).
