Electric Field Question: Calculating Electron Speed and Ignoring Gravity

[DLxX]

Please help me with the following question:

An electron (mass m = 9.11 X 10^-31 kg) is accelerated in the uniform field E (E = 1.85 X 10^4 N/C) between two parallel charged plates. The separation of the plates is 1.20cm. The electron is accelerated from rest near the negative plate and passes through a tiny hole in the positive plate. (a) With what speed does it leave the hole? (b) Show that the gravitational force can be ignored.

I would also REALLY appreciate it if someone could direct me to a site that teaches this particular part of physics. I usually check things like this that I don't understand on www.physicsclassroom.com, but they don't teach this particular area.

 

[Tide]

HINT: Calculate the potential difference between the two plates and recognize that energy is conserved! :-)

 

[futb0l]

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html
Tide's hint should be enough, but here's a site that has almost everything you'll need in physics.

 

[DLxX]

HINT: Calculate the potential difference between the two plates and recognize that energy is conserved! :-)

Which formula do I use for this?

 

[MathStudent]

The equation is: V = ED

 

[DLxX]

After reading around a bit more, I think I figured it out.

This is the answer I got 8,846,517 m/s. Is that even close to right?