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## Homework Statement

In a cathode ray tube, electrons are accelerated from rest by a constant electric force of magnitude 6.4E-17 N during the first 2.0cm of the tubes length; then they move at essentially constant velocity another 45cm before hitting the screen.

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

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

## Homework Equations

Delta(v)subx = Vsub(f)x - vsub(i)(x) = asubx(delta(t))

## The Attempt at a Solution

well, we can reduce the equation to:

Delta(v)subx = asubx(delta(t))

but then I only have a force in Newtons, and a distance of 2.0cm, then another 45cm at a constant velocity. So I don't even know how I can derive anything like Delta(t) or asubx.

Thank you

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