Question

What are some examples of relative speed?

Answer 1

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

Explanation:

There are some examples on this

1. 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.

2. 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.

3. If there are two athletes competing against each other on the same direction on the track, it is also a example.

4. Two airplanes flying on the opposite directions with different speeds.

etc.