In a certain cathode-ray tube, a beam of
electrons, moving at a constant velocity,
enters a region of constant electric force
midway between 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 10^6 m/s, what is the acceleration that
needs to be applied so that the electrons
just miss the upper deflection plate