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

Ah yes. It depends on your reference point. Compared to the train, you are traveling at 10 mph. Compared to the ground, you are traveling 110 mph.

Compared to the pen in your pocket, you are standing still.

Compared to the guy standing at the North Pole, you are traveling at 800 mph.

Compared to the sun, you are traveling (guessing, because I’m too lazy to look it up) 20,000 mph. Compared to the galactic center, you are traveling 100,000 mph.