A particle leaves the origin with a speed of 3.3 times 10^6 m/s at 38 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis.
1) Find Ey such that the particle will cross the x axis at x = 1.5 cm if the particle is a proton.
2) Find Ey such that the particle will cross the x axis at x = 1.5 cm if the particle is an electron.