1. The problem statement, all variables and given/known data A proton (+e) accelerates from rest in a uniform electric field of 640 N/C. At some later time, the proton's speed is 1.20 x 10^6 m/s. Find the acceleration of the proton. The mass of a proton is 1.67x10^-27 kg. Charge on a proton is +1.6x10^-19C. 2. Relevant equations F=ma F=qE 3. The attempt at a solution F=qE F=ma ma=qE (1.6x10^-19)(640)=(1.67x10^-27)(a) a=6.13x10^10m/s^2 I don't think this is correct. I ignored the (+e) because I didn't know what to do with it. Wouldn't an electron and a proton mean a net neutral charge? Also, the acceleration is just way too high. The particle would have to travel faster than the speed of light for a short time.