onClipEvent (load) {
    V0 = 14;
    R = -70*Math.PI/180;
    Vx = V0*Math.cos(R);
    Vy = V0*Math.sin(R);
}
onClipEvent (enterFrame) {
    Vy += 0.3;
    _x += Vx;
    _y += Vy;
    this._rotation += Math.atan(Vy/Vx)*180/Math.PI-this._rotation;
}