I'm trying to understand this formula but I'm stuck. I've looked up how to obtain the initial velocity, the acceleration, and time. But all I see are formulas, I don't know how they got it. Can someone guide me through this please? D = Vit + 1/2at2 Vi = (d - 1/2at2) / t a = 2 x (d - Vit) / t2 t = -Vi / a [itex]\pm[/itex] (√[\(Vi)2 + 2ad]) / a http://http://answers.yahoo.com/question/index?qid=20090621164821AAHxOMD Here's my reference.