A constant electric field accelerates a proton from rest through a distance of 1.25 m to a speed of 1.69 x 105 m/s. (The mass and charge of a proton are m, = 1.67 x 10-27 kg and = e = 1.60 x 10-19 9p C.) HINT (a) Find the change in the proton's kinetic energy (in J). J (b) Find the change in the system's electric potential energy (in J). J (c) Calculate the magnitude of the electric field (in N/C). N/C