Question: In the electron-positron collider at Cornell University, electrons and positrons acquire oppositely directed momenta of 4.0GeV/c before they collide head-on.
a. Suppose that after the two particles collide they unite to form a new particle at rest. What is the rest mass of the new particle?
b. Suppose the new particle decays into a proton and an antiproton that move in opposite directions. What is the kinetic energy of either particle?
c. What is the velocity relative to the speed of light, and what is the momentum of either particle?