title: How to move image use onFling
body: <p>I have a very long picture.</p>
  
  <p>and how can I use the parameter velocityY of onFling to move this picture</p>
  
  <p>This picture will move fast at first, and then move slow down.</p>
  
  <p>like this fling effect: <a href="http://www.youtube.com/watch?v=Y1sMWF72Cn8&amp;hd=1&amp;t=5" rel="nofollow">http://www.youtube.com/watch?v=Y1sMWF72Cn8&amp;hd=1&amp;t=5</a></p>