Creative Tank

Select "Oval Tool" and drag a circle on stage.

Click "Modify" menu, choose "Convert to Symbol" or press F8 key on keyboard, Input text for "ball”, and click "OK" button

Right push the thirty frames on timeline, and select "Insert Key frame" from the menu, Then Drag the "ball" from left to right with "Move Tool".

At first frame, right click and select "Create Motion Tween" from the menu

Click "Control" menu and select "Test Movie”, or press "ctrl + Enter" to make public the flash as SWF.