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## Homework Statement

http://grephysics.net/ans/9277/70

I'm not interested in how you get the right answer, I'm really just curious if somebody could show me where my thought process was flawed.

Total Energy = E = 100mc^2

Rest Energy = Mc^2

Total Energy = Kinetic Energy + Rest Energy

100mc^2 = p^2/2m + mc^2

99mc^2 = p^2/2m

198(mc)^2 = p^2

sqrt(198)mc = P

and yet the correct answer is

10^4(mc)

where is my method flawed?