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## Homework Statement

A particle of mass M = 7m decays into two particles of mass m - one travels in the '+y' direction, the other in the -y' direction.

In the rest frame of M, find the total energy(in terms of m) and the speed of each m.

## Homework Equations

E = mc

^{2}

[tex]\frac{u}{c}[/tex] = [tex]\frac{pc}{E}[/tex]

## The Attempt at a Solution

I figured out the mass of each of the small particles is half of the rest energy of the parent particle and it came out to be (3.15x10^17 * m)Joules. I just dont know how to manipulate the equations to find the speed of each m...?