Looking for this example to understand a set of physics things

Hello, I was looking this proyect worked with another framework:

http://appcodingeasy.com/Gideros-Mobile/Dragging-Box2d-object-in-Gideros-Mobile

and it is what I’m trying to do, but I just only get worked the gravity and the drag & drop without speed or “throwing” movement… I can’t find anything on the web, have you ever seen an example like this? (even for Obj-C).

Thanks.

@saulhudson
I do not know for what reason you are using other framework.
Cocos2dx has all the power of Box2D.

You can see this example:
http://www.raywenderlich.com/28604/how-to-create-a-breakout-game-with-box2d-and-cocos2d-2-x-tutorial-part-1

Put a lot of attention to the section “Moving The Paddle”