# Physics converting between kg, J, MeV, MeV/c^2 !??!??!

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#1
I can't seem to get my head around the conversions. I usually do random combinations on my calculator until I get an answer that seems right but I don't actually know what I'm doing.

For starters what even is MeV/c^2??? Is there an easy method if given any question using E=mc^2 just to aid my understanding of what each of the elements actually are. Thanks a lot!
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5 years ago
#2
E is in J, to convert that into eV you divide by constant e (1.6 x 10^-19)
This is because 1eV= 1x10^-19J
to convert eV to MeV you divide by 10^6 (M=Mega = 10^6)
Mass is always in kilogram
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