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## Homework Statement

A particle with mass M at rest decays into two particles, one with mass m1, and the other with mass m2. Use conservation of energy and momentum to show that:

E1 = (M^2 + m1^2 - m2^2)(c^2)

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2M

## Homework Equations

p = mv / sqrt(1-v^2/c^2)

E = mc^2 / sqrt(1-v^2/c^2)

E = sqrt(p^2*c^2 + m^2*c^4)

## The Attempt at a Solution

I think that it has something to do with 4-vectors, but I'm not sure. Thanks in advance!