1. The problem statement, all variables and given/known data A proton and an antiproton, each with an initial speed of 5.90 107 m/s when they are far apart. When these two particles collide, they react to form two new particles: a positive pion (π+, charge +e) and a negative pion (π−, charge −e). Each pion has a rest mass of 2.5 10-28 kg. These pions have enough energy that they move away from each other. When these two pions have moved very far away from each other, how fast is each pion going, v? 2. Relevant equations E of system = kinetic + rest + potential energies kinetic = 1/2mv^2 rest= mc^2 electric potential = (9x10^9)(q1 * q2)/radius 3. The attempt at a solution Esys1 = Esys3 (2) (1/2) (1.7x10^-27) (5.9x10^7)^2 + (2) (1.7x10^-27) (3x10^8)^2 = (2) (1/2) (2.5x10^-28)(v final)^2 + (2) (2.5x10^-28) (3x10^8)^2 v = 1.03328 x 10^9 This answer turned out to be wrong! Can anyone see where I went wrong?