Kinetic energy released by relativistic decay
= Kinetic energy released by relativistic decay
{title2=$Q=(M-\sum_i m_i)c^2$}
For an isolated decay of a parent of <rest mass> $M$ into products of <rest masses> $m_i$, the difference between total final and initial <kinetic energies> is $(M-\sum_i m_i)c^2$ in every <inertial frame>. Conservation of total <energy> and inclusion of all products are essential.