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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 1.0x10^7m/s. What is the surface charge density of the plane?The answer is 2.52×10−7 C/m^2 !

## Homework Equations

v=d/t, d=0.5at^2, E=n/2*8.85x10^-12, F=ma=Eq

## The Attempt at a Solution

I don't know what to do with the velocity. I tried relating it to energy but got stuck.