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n a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.6 ? 10-17 N during the first 1.9 cm of the tube's length; then they move at essentially constant velocity another 47 cm before hitting the screen.
(a) Find the speed of the electrons when they hit the screen.
m/s
(b) How long does it take them to travel the length of the tube?
ns
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