- #1

Froskoy

- 27

- 0

## Homework Statement

A particle, observed in a particular reference frame, has a total energy of 10GeV and a momentum of 6GeV. What is its mass in units of GeV/c^2?

## Homework Equations

I used [tex]p=\gamma mv[/tex]

and

[tex]E=\gamma mc^2[/tex]

## The Attempt at a Solution

So I divided the above equation for P by the equation for E to get

[tex]\frac{P}{E} = \frac{v}{c^2} \Rightarrow v=\frac{P}{E}c^2[/tex]

and then substituting back into the quation for E:

[tex]m = \frac{E}{\gamma c^2} = \frac{\sqrt{1-\frac{P^2}{E^2}}E}{c^2}[/tex]

But this doesn't give the correct answer - any ideas?

With very, very many thanks,

Froskoy.