If you run 10mph inside of a train that is moving 100mph, are you moving 110mph or 100mph?

Question

If you run 10mph inside of a train that is moving 100mph, are you moving 110mph or 100mph?

In: Physics

Answer 1

It is called frame of reference.

To an outside observer, witht he train moving 100mph, you walking inside would be walking at 110 miles an hour, but to YOU inside the train doing the moving, you are moving at 10 Miles an hour.

Same for the ISS. It orbits at 17500 Miles an hour, but are the astronauts traveling at 17500 miles an hour ?, YES, but inside the ISS, they move about at normal speeds. Again, it is Relative to the observer.

Observer on the ground looking up, or looking inside the ISS ?