Problem 3. (1 point) E X A uniform field E = -180000j N/C exists between two plates of length L = 3 cm, as shown in the figure above. A proton is fired at an angle of 45 to the xaxis with an initial speed of 8200000m/s. a) Find its vertical coordinates as it emerges from the plate, as- suming the proton will not hit any plate in the process. .cm b) Find the angle at which it emerges. degrees to the xaxis