Parabola AS3

Hi I'm a student doing an assignment where I need to animate an arrow flying to a falling target. As this is for a physics subject it needs to be in a lifelike environment hence using functions instead of motion tweening. I am new to AS3 and have some code that should use a parabola function to animate the flying arrow. I am getting three errors at the moment:

• Line 6 1084: Syntax error: expecting leftbrace before semicolon.
• Line 56 1084: Syntax error: expecting rightbrace before end of program.
• Line 56 1084: Syntax error: expecting rightbrace before end of program.

Here is the code:

package

{

          import flash.display.Sprite;

          import flash.display.MovieClip;

          {

                    public class Arrow extends MovieClip;

                    {

                        public static const g:Number = 10;

                                  //our arrow

                                  private var arrow:Shape;

                        //start velocities

                        private var ux:Number;

                        private var uy:Number;

                        public function Arrow()

                        {

                            arrow = new Shape();

                            arrow.graphics.lineStyle( 1, 0 );

                                     arrow.graphics.lineTo( 30, 0 );

                        }

                        public function fire( vx:Number, vy:Number ):void

                        {

                            ux = vx;

                            uy = vy;

                            addChild( arrow );

                            addEventListener( Event.ENTER_FRAME, fly );

                        }

                        private function fly( e:Event ):void

                        {

                            //lets use our equations

                            var sx:Number = ux;       //distance moved in x dir

                            var vy:Number = uy + g    //new velocity in y dir

                            var sy:Number = uy + g/2  //distance moved in y dir

                            //apply to arrow

                            arrow.x += sx;

                            arrow.y += sy;

                            //save new y velocity

                            uy = vy;

                            //extra bonus rotation of arrow to point in the right direction

                            arrow.rotation = Math.atan2( uy, ux ) * 180 / Math.PI;

                        }

          }

}

Any help to get this working would be greatly appreciated.

Note: This is in an external class file (.as) and is linked to the document class.