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## Homework Statement

An electron is fired at a speed of v0 = 5.6 × 106 m/s and at an angle of θ0 = – 45° between two parallel conducting plates that are D = 2.0 mm apart, as in Figure P16.66. If the potential difference between the plates is ΔV = 100 V, determine (a) how close d the electron will get to the bottom plate and (b) where the electron will strike the top plate.

That is the exact question from the textbook. there is a diagram that shows the two plates and the electron starting in the middle of the two plates.

## Homework Equations

I'm assuming you'll need Ei=Ef or some sort of projectile motion. I really dont even know that.

## The Attempt at a Solution

I havent the foggiest idea for part b, but for part a I attempted to do it like this and got an answer. I did Ei=Ef for the first part and set KE=electrical potential energy. Then substituted (delta)v over D for E and was able to solve for E and get 50000 v/m and then solved the equation for d and got 1.79 x 10^-3 m. Is that ok? and please any help. I really need it badly.