1. The problem statement, all variables and given/known data A proton accelerates from rest in a uniform electric field of 640N/C. At some later time, its speed is 1.20x10^6m/s. a) Find the magnitude of the acceleration of the proton. b) How long does it take the proton to reach this speed? c) How far has it moved in that interval? d) What is its kinetic energy at the later time? 2. Relevant equations 3. The attempt at a solution I think I can figure this problem out after knowing how to get started. I was confused as to how to start without having the mass. Any help?