formula for acceleration?

[josher1289]

what is it?

[jtbell]

\vec a = \frac{d \vec v}{dt}

[z-component]

Also, if the original poster is just starting out with physics and is not using calculus, I could provide a more basic equation:

a = \frac{\Delta v}{\Delta t},

or simply the change in velocity over the change in time.