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Re: [Phys-l] Relativity Question about spring



John wrote:
It's the same sort of thing:
the laws of relativity don't distinguish one type of potential
energy from another.

So, the increase in elastic potential energy of a spring will effectively increase the spring's mass. The increase in gravitational potential energy of a muon will increase the muon's mass. If a muon is moving towards the earth, its mass would decrease. This seems to be John's conclusion. :-)

Alphonsus