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## Homework Statement

Ok so im given the masses of D meson, pi meson and K meson and told that a D meson at rest decays into a K meson and pi meson. Told to calculate the energy and velocity of the pi meson..

## Homework Equations

## The Attempt at a Solution

well i know you have to use conservation of 4 momentum..

so energy before = total energy after..and i know that the momenta of the pi and K meson after the collision are equal and opposite, but i cant see how to use this to get total energy of pi meson..:S

any tips?