I have no idea what your actual question is so how are we supposed to deduce this equation?
my advice is: the next time you take a class, pay attention, and ask for help before the last minute. You want your teacher to give you credit for doing something you don't even understand, and you want us to help you in your deceit. I won't, and I don't think anyone else should, but I can hardly stop them.
I'm going to assume you are starting a Summer Physics program of some kind, so your equation would be one involving Kinematics rather than Work-Energy.
I'll go so far as to give you the two pertinent equations:
As this appears to be part of an assignment that is for a grade let's see what you can do with these.