1. The problem statement, all variables and given/known data An antiproton (same properties as a proton except that q=-e) is moving in the combined electric and magnetic fields of the figure The antiproton is moving to the right with a velocity of 500m/s the magnetic field B=2.5T is coming into the page and E=1000V/m downward. What is the magnitude of the antiproton's acceleration at this instant? 2. Relevant equations F=ma, F=qvB 3. The attempt at a solution The answer is 2.4x10^10m/s^2. I bascially went ma=qvB which didn't work. I'm not sure why it shows E.