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## Homework Statement

A particle of unknown mass M decays into two particles of known masses m1 = 0.5 GeV/c2 and m2 = 1.0 GeV/c2, whose momenta are measured to be p1 = 2.0 GeV/c along the positive y-axis and p2 = 1.5 GeV/c along the positive x-axis. Find the unknown mass M and its speed.

## Homework Equations

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

## The Attempt at a Solution

I tried summing the momentas, via pythagoras theorem. after that I'm not sure.