Ok I took a shot at getting Box2d working in DroidScript.
I used this as resource:
It is fully working except the ground seems to pivot occasionally. I may not quite have the settings correct, or it could be Droidscript not sure.
Perhaps someone else even has a better working demo they can post or possibly post a fix to what I've provided.
Note: You'll need to edit this line to your screen size to try it out (line 36 in MyApp.html)
<canvas id="c" width="600" height="800"></canvas>
It would be cool to see Box2d added to Droidscript. :)