(Solved): A proton enters the uniform electric field produced by the two charged plates shown in the figure. ...

A proton enters the uniform electric field produced by the two charged plates shown in the figure. The plate length is $$L=12.0\mathrm{cm}$$. The magnitude of the electric field is $$6.0\times 10^4\mathrm{N}/\mathrm{C}$$, and the speed of the proton when it enters is $$0.8\times 10^7\mathrm{m}/\mathrm{s}$$. What distance $$d$$ has the proton been deflected downward when it leaves the plates? Give you answer in units of $$\mathrm{mm}$$.