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## Homework Statement

An electron with initial velocity vx0 =1.0 *10^4 m/s enters a region of width 1.0 cm where its electrically accelerated. it emerges with velocity vx = 4.0 *10^6

what was its acceleration, assumed constant?

## Homework Equations

F = ma

v^2 = u^2 + 2as

## The Attempt at a Solution

Well I thought I would try this

(v^2 - u^2)/2s =a

but this did not work.

Im guessing I am going to need to find E?

But dont know how to do this with given information.

can someone point me in the direction of the formula needed for the question?

thanks!

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