as 2 to as 3

hello,,I have a trouble,, I want to make an interactive media simulation,,in as 2 I can, but to change the script in as 3 I don't know,,could you help me please to change this script into as3

Frame 1

var x0:Number;

var v0:Number;

var a:Number;

var t: Number;

var s:Number;

var t_travel:Number;

var t_base:Number;

function inisialitation(){

                car._x = 0;

                x0=car._x;

                s=0;

                v0=0;

                vt=v0;

                a=0;

                t=0;

                t_travel=0;

                delta=0.1;

}

inisialitation();

stop();

Frame 2

if(t<=t_travel){

                car._x = x0+v0*t+(1/2)*a*t*t;

                vt=v0+a*t;

                s= car._x-x0;

}else{

                s= v0*t_travel+(1/2)*a*t_travel*t_travel;

                vt = v0+a*t_travel;

                stop();

}

Frame 3

t=t+delta;

gotoAndPlay(2);

thanks for your attention