- #1
recon
- 401
- 1
My physics book tells me: "A person who runs, and thus gains kinetic energy, gains mass (albeit negligible) according to Einstein's mass-energy relation."
I do not think that any energy has been gained from 'outside' the system since the kinetic energy is derived from chemical energy that is already in the body prior to the run. So, how can the body have gained mass?
I do not think that any energy has been gained from 'outside' the system since the kinetic energy is derived from chemical energy that is already in the body prior to the run. So, how can the body have gained mass?