Hello everyone. I am new here and am quite excited to start learning about physics which intrigues me greatly. I"m not studying physics or anything like that but just very interested in it and wish to work my way up to asking more advanced questions but first feel I need to be able to grasp some more primitive concepts. So here is the first one: if I'm standing on top of a train moving 500mph in the west direction, and I fire a bullet from a gun, what happens if the bullet travels at 500mph? If the train is going west and I fire the bullet west, does the bullet now travel 500mph from my frame of reference (since I'm already on a 500mph train) and thus 1000mph from an observer that's standing on the ground? And what happens if I fire the bullet in the east direction? Does an observer on the ground just see the bullet spin in place and drop on the ground near him? Thank you all.