Let's say there is an object flying around (in a straight line), which has a constant speed $v$ and zero acceleration.
In some moment I can apply a constant deceleration $a$ to that object and I need to find a distance $d$ which will be traveled until the object stops.
Based on this formulas: $v = at$, $d = \frac{1}{2} at^2$ I wrote this:
$d = \frac{v^2}{2a} $
My question, is that correct and if not, what is ?