# Homework Help: State why the total energy after proton and antiproton collide is more than before

1. Nov 13, 2011

### charged-ant

1. The problem statement, all variables and given/known data
In a particle accelerator a proton and an antiproton, travelling at the same speed, undergo a head on collision and produce subatomic particles. The total kinetic energy of the two particles just before the collision is 3.2 x 10$^{}-10$ J.

State why the total energy after the collision is more than 3.2 x 10$^{}-10$ J.

2. Relevant equations
e=mc$^{}2$
hf$_{}min$ = E$_{}0$ where E0 is rest energy of electron

3. The attempt at a solution
I thought energy, mass and charged were conserved...

Last edited: Nov 13, 2011