(III) An electron (mass m = 9.11 X 10-31 kg) is accelerated in the uniform field (E =1.4...

(III) An electron (mass m = 9.11 X 10^-31 kg) is accelerated in the uniform field (E =1.45 X 10⁴ N/C) between two thin parallel charged plates. The separation of the plates is 1.60 cm. The electron is accelerated from rest near the negative plate and passes through a tiny hole in the positive plate, Fig. 16–61. (a) With what speed does it leave the hole? (b) Show that the gravitational force can be ignored.