A student runs around a 400 m oval track in 80 s. Would the average velocity and average speed be the same? Explain?4

No, the speed and velocity would be different in this case.

Explanation:

As we know that speed is the distance covered by a body per unit time and velocity is the displacement per unit time.

Displacement is the shortest distance between the final and the initial points.

In an oval path the distance is the path traced on the periphery of the oval track and its displacement will be the shortest distance between the final and initial position of the runner, i.e. the straight line joining the final and the initial position.

Displacement will always be lesser than the distance here and hence the velocity will always be smaller than the speed.

where are the vectors ?