Recent content by Physics Student 1234

My understanding is that the terms are synonymous but I'm just wondering if there is a subtle difference between the two terms which I am unaware of.

I've posted the rest of the question. My attempts at this part of the question are lots of messy algebraic manipulations. I'd just like to know the correct way to approach the problem.

Homework Statement Homework Equations E = γmc2 p = γmv K = E - mc2 E2 = c2p2 + m2c4 The Attempt at a Solution I have completed most of this question, but I am struggling to get the required result to the final part of the question.[/B]