Physics: a shell is fired with a horizontal velocity...?

[Nick]

A shell is fired with a horizontal velocity in the positive x direction from the top of an 80 meter high cliff. The shell strikes the ground 1330 m from the base of the cliff.
1. Determine the initial velocity:
2. What is the velocity of the shell as it hits the ground?
I have the answers at 330 m/s for both of them, but does anyone know the equations for how to determine the answer?

 

[Aaron]

well what exactly is velocity, i beleive velocity is mass x acceleration, so, we would need to know the, oh wow fuck this, lol we havent learned physics yet, hmmm that is weird, either way i would love to know how you solve this, ill be watching this thread for a while to see what it is!