College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 51

Protons are projected with an initial speed v 0 = 9 550 m/s into a region where a uniform electric field of magnitude E = 720 N/C is present (Fig. P15.64). The protons are to hit a target that lies a horizontal distance of 1.27 mm from the point where the protons are launched. Find (a) the two projection angles that will result in a hit and (b) the total duration of flight for each of the two trajectories.