Part 1

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.40 10¹⁷ N during the first 7.20 cm of the tube's length; then they move at essentially constant velocity another 45.0 cm before hitting the screen.

Find the speed of the electrons when they hit the screen.

m/s

Part 2

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.40 10¹⁷ N during the first 7.20 cm of the tube's length; then they move at essentially constant velocity another 45.0 cm before hitting the screen.

How long does it take them to travel the length of the tube?

ns