A particle of mass m with charge q > 0 flies into a flat capacitor, the plates
of which are metal grids. The field strength in the capacitor E, the distance
betweenthegridsd. Theinitialvelocityv oftheparticleisanangleαwiththe
plane of the first grid. How fast and at what angle to the plane of the second
grid will the particle fly out of the capacitor?