In a certain cathode-ray tube, a beam of electrons, moving at a constant velocity, enters a region of constant electric force midway among two parallel plates that are 10.0 cm long and 1.0 cm apart.
In this region, the electrons experience an acceleration, a, toward the upper plate.
If the electrons enter this region at a velocity of 3.0 x 106 m/s, what is the acceleration that requires to be applied so that the electrons just miss the upper deflection plate?