in the cathode ray tube in an old television set, electrons are accelerated from rest with a constant acceleration of magnitude 7.31*10^13 m/s2 during the first 2.77cm of tube's length; then they move at essentially constant velocity another 48.7cm before hitting the screen.
(a) find the speed of the electron when they hit the screen.
(b) how long does it take them to travel the length of the tube?