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**1. Homework Statement**

A particle with mass M decays into 2 particles of equal mass m.

1: Calculate the speed of the decay particles

2: Concider the case ρ->[tex]\Pi\Pi[/tex]: M = 770 MeV and m[tex]\Pi[/tex]= 140 MeV

**2. Homework Equations**

m = [tex]\gamma[/tex]m(restmass) ?

**3. The Attempt at a Solution**

I suppose M/2 is restmass and found an expression for the speed. However since the mass increase when the speed approaches the speed of light, this would imply that m is a larger number than M/2. But in task 2, it says M/2 is larger than m[tex]\Pi[/tex], which implies i've done something wrong.

Please help me solve this task or find out what i did wrong.