Abstract
At the International Congress "CAR 2011_1312" I will attend with a proper method for automobile collision velocity determination through the decomposition of the retrospectively motion. Starting from the post-impact motion, retrospectively from the place where the automobile stop, determine the speed on the law of energy conservation. Follows the sequence itself on the same principle by forming a system of two equations with two unknown, by resolution which retains the actual (positive) value, followed by motion before the collision which is solved by classical formula according traces of braking.
Keywords: Impact, Movement, Speed, Energy, Equation