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## Homework Statement

http://grephysics.net/ans/8677/20

So to do this, I solved for the total rest energy of both particles.

The rest energy of Kaon + K = Rest energy of Proton

Rest energy of Proton - Rest Energy of Kaon = K

K = P^2/2m

((Rest Energy of Proton - Rest Energy of Kaon)*(2*Mass of Kaon))^1/2 = P

P = mv/(sqrt(1-v^2/c^2)

If I do this and do all the algebra correct and solve for v, will this method give me the correct answer? I got the wrong answer but I suck at numbers X_x.

I realize after looking at the answers on the website this is a poor way to do this problem with GRE time constraints, I just want to know if this thought process is flawed or not.