# Why relativistic momentum equals the following?

In a solution to a problem we were given, it is written that a positron momentum with energy of 2mc2
(where γ=2) is √(γ2-1)*mc = √(4-1)*mc = √3*mc

How did they get that P=√(γ2-1)*mc?

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Nathanael
Homework Helper
You are familiar with p = ϒmv right?
And also with ϒ = 1/√(1-(v/c)2) right?

Eliminate v from the two equations and what do you get?

Foruer
What I get is the answer thank you

Orodruin
Staff Emeritus