Relative movement and agreement about an object's speed

In summary, the observer inside the train thinks that the train is not moving, while the observer outside the train thinks it is moving at a constant velocity. However, the total kinetic energy of the train is zero if the observer inside the train calculates it that way.
  • #36
russ_watters said:
There are no violations in there that I can see
"In There" means what I wrote or what you wrote
 
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  • #37
Quarlep said:
"In There" means what I wrote or what you wrote
In what you wrote.
 
  • #38
Thank you
 
  • #39
Quarlep said:
So train kinetic energy depends referance frame.
Yes. This is the key point. Anyone can choose to use any inertial reference frame they wish (no requirement to use their own), but that choice affects the value of the KE.
 

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