Object movement using actionscript

programming flash
1

I’ve been trying to move a movieclip using actionscript by changing the coordinates of the movie clip

here’s my code

i named the movieclip “bola”


on (release) {

    for (t=0; posy != 0; t++) {
        posx=(3 * t * Math.cos(60))
        posy=(3 * t * Math.sin(60) - 0.5 * 9.81 * t * t)
        _root.bola._x = posx
        _root.bola._y = posy
    }
}

but something’s missing me… because when i press the button the movie moves to position x=0 y=0 and not the projectile movement that i want …
is the for cycle wrong ??

can anyone check what’s wrong with my code ??? :cross-eye