1. The problem statement, all variables and given/known data Write down a relation between the total relativistic energy, mass and momentum of a particle. An antiproton has a total energy of 5.00 GeV. Calculate its momentum and its speed. 2. Relevant equations E = γmc^2 E = (cp)^2 +(mc^2)^2 p = γmv 3. The attempt at a solution I've tried subbing everything in and playing around with the algebra but I cant get an expression entirely in terms of v or p. Also how do you get the proper math equations on here? Are the tags [itex]?