What are some examples of relative speed?

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Answer 1 · 2018-05-15T08:54:21

A passenger in a vagoon walking against the train direction, etc.

There are some examples on this

If a passenger in a vagoon walking against the train direction, of course the train speed is greater and $v_n = v_t - v_p$ is the speed. In this formula $v_n$ is the net speed and $v_t$ and $v_p$ are train speed and passenger walking speed respectively.
If there is a river flowing at a constant speed, and a swimmer swimming within the river course (in the same direction), the net speed $v_n = v_r + v_s$
$v_n$ is the net speed and $v_r$ and $v_s$ are river speed and swimmer's speed respectively.
If there are two athletes competing against each other on the same direction on the track, it is also a example.
Two airplanes flying on the opposite directions with different speeds.

etc.