sqrt ((3.761×10^-19 kilogram meters per second)^2 c^2 + (proton mass ^2 * c^4)) - (proton mass * c^2)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.