A man jumping inside a high-speed train will land back on the same point if the train is moving at a uniform velocity and there is no air friction. If the room is open, external air resistance may push him slightly backward. The discussion draws parallels to the Earth's movement through space, reinforcing the concept of inertia. The consensus is that, under ideal conditions, the man will return to point A after jumping. This highlights the principles of motion and inertia in a closed system.
#1
darkness_limits
11
0
if a man is standing on a point "A" inside a train moving at a very high speed then he jumped . will he land on the same point A?
Most certainly yes (if there is no air friction, or the room he is in is closed).
If the room is open, so the air outside will push the man a little bit backwards.
Yes, provided the train is traveling at a uniform velocity. You could consider the Earth traveling through space as your "train". If you were to jump you would land on the same spot, yes?
Do we even know? My understanding of dark energy is that particles come into existence, exert and outward force, then vanish. My problem with that is how, of course, then how does dark energy know to push everything in the same direction? The pressure exerted would be in all directions, even if the space was moving so why isn't stuff pushed all over the sky?
Thanks - rev