What facts or definitions do you have to start with? (Are you taking an algebra-based or calculus-based course?) [By the way, post your question in only one thread.]
Start with acceleration, "a." You know that the second derivative of "a" is "s'', where "s" is the position. Integrate twice and adjust for the constants.
∫a dt = at+v_{0} = v
∫v dt = .5at^{2}+v_{0}t+s_{0} = s
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