Question

The electron beam in a television tube consists of electrons accelerated from rest through a potential difference of about 20000v. what is the speed of electrons ? ( ignore relativistic effects). Electron rest mass is 9.11 x 10^-31 kg and electronic charge is 1.6 x 10^-19 C.
A) 8.4 x 10^7 m/s
b) 3.8 x 10^6 m/s
c) 6 x10^6 m/s
d) 4.7 x 10^7 m/s