A Proton is traveling horizontally to the right at 4.5 x 106 m/s.
(a) Obtain the magnitude and direction of the weakest electric field that can bring the proton uniformly to rest over a distance of 3.2 cm.
(b) Find how much time does it take the proton to stop after entering the field?
(c) Find what minimum field would be needed to stop an electron under the conditions of part (a)?