A test pod travels along a winding subterranean track designed for vacuum-tube transportation research.
The maximum safety speed for the pod on this specific section of the track is 45 m/s45\text{ m/s}45 m/s. The length of the curved track between two consecutive monitoring sensors is 3.6 km3.6\text{ km}3.6 km.
Calculate the minimum time, in seconds, it takes the pod to travel between the two sensors without exceeding the maximum safety speed.
Explain why the average speed of the pod and the magnitude of its average velocity between these two sensors are different.