A proton enters through a small hole in a metal plate with a speed of 8.00*10^5 m/s at an angle of 55.0° as shown in the diagram. The uniform field in the region above the plate has magnitude of 7.30*10^3 N/C and is directed downward. The region above the metal plate is essentially a vacuum, so there is no air resistance.
How far will the proton travel, ?x, before it hits the metal plate?