What are some examples of relative speed?
1 Answer
A passenger in a vagoon walking against the train direction, etc.
Explanation:
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.