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## Homework Statement

The surface charge density on an infinite charged plane is -2.6*10^-6 C/m^2. A proton is shot straight away from the plane at 2.2*10^6 m/s. How far does the proton travel before reaching its turning point?

## Homework Equations

Im very unsure of what equations to use, the only one I know is the equation for density charge. n=Q/A

## The Attempt at a Solution

Im trying to figure out how to incorporate kinematic equations with the electric field equations. I think I may need to use the force equation for the electric field somehow.