I have a lambda decaying into a pion and a proton. The lambda is moving with velocity 0.9c and I know the mass of the lambda as well as the pion and proton (these are known constants). I need to find the momentum of the pion and the proton after the decay happens.
Conservation of momentum and conservation of energy
The Attempt at a Solution
I don't know at this point which momentum to choose out of the two. I solved the math using a software so I would assume it is right.