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## Homework Statement

How much work is required to accelerate a proton from rest up to a speed of 0.999c?

What would be the momentum of this proton?

## Homework Equations

p=γmv

## The Attempt at a Solution

I got part A, which was the momentum. I found that to be 20.1 GeV. Now for part B I have to find the momentum in units of GeV/c. I'm down to my last attempt on Mastering Physics. First, I tried going the simplest route and divided the 20.1 GeV from part A by c to get 6.7e-8 and that was wrong. I also tried using p=γmv to find an answer of 1.12e-5 J, which I converted to 7.01e-8 GeV, then divided that by c and got an incorrect figure of 2.34e-16.

Any help would be greatly appreciated.