- #1
frankencrank
- 21
- 0
If we want to know the totality of the energy of an object/particle do we only have to look at the mass, since mass changes with speed, or do we have to also add the classical kinetic energy of the object to the changed mass energy?
I think it is is former but it is not obvious to me right now why.
I think it is is former but it is not obvious to me right now why.