1. The problem statement, all variables and given/known data In the cathode-ray tube, electrons having a mass m are emitted from a source point S and begin to travel horizontally with an initial velocity v0. While passing between the grid plates a distance l, they are subjected to a vertical force having a magnitude eV/w, where e is the charge of an electron, V the applied voltage acting across the plates, and w the distance between the plates. After passing clear of the plates, the electrons then travel in straight lines and strike the screen at A. Determine the deflection d of the electrons in terms of the dimensions of the voltage plate and tube. Neglect gravity which causes a slight vertical deflection when the electron travels from S to the screen, and the slight deflection between the plates. See attachment for picture 2. Relevant equations ∑Fy = may vy = ayt 3. The attempt at a solution By Newton's 2nd Law, ay = eV/mw from 0 to l By kinematics t1 = l/v0 t2 = t1 + L/v0 = l/v0 + L/v0 From 0 to l, by kinematics: y1 = 1/2*eV/mw*(l/v0^2) (v1)y = eV/mw*l/v0 Hence, from l to L where ay is zero y2 = d = 1/2*eV/mw*l^2/v0^2 + eV/mw*L/v0 It appears the solution is missing the left term I keep getting, any idea why?