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## Homework Statement

An electron is released from rest 2.0 cm from an infinite charged plane. It accelerates toward the plane and collides with a speed of 1*10

^{7}m/s

What is the surface charge density of the plane?

## Homework Equations

a=(qE)/m

v=v

_{0}+a∆t

## The Attempt at a Solution

v

_{0}=0

therefore a∆t = 1*10

^{7}m/s

∆t=L/v

_{0}

calculating the time ∆t requires knowledge of either v

_{0}or

**a**, v

_{0}is zero, so one cannot calculate it using v

_{0}, so the other option is to use

**a**, which is unknown also

How would I go about this?

Once I have

**a**, i can find E using the formula

**a**=(qE)/m

Thanks

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