Help with deriving a physics equation?

I was given a question and from that we are supposed to derive an equation using only the variables in the question and gravity (g) if needed to get the following equation and I am stuck on this one, any help would be great, thanks, best answer! An electric motor is attached to a car of mass m. The motor... show more I was given a question and from that we are supposed to derive an equation using only the variables in the question and gravity (g) if needed to get the following equation and I am stuck on this one, any help would be great, thanks, best answer!

An electric motor is attached to a car of mass m. The motor applies power P to the car for t seconds. What is the velocity (v) of the car?
Answer: v= square root of 2Pt/m
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