How to move the arrow by dragging and then after that to toss/throw it?

In my application I have one arrow image with fix center and I can rotat开发者_StackOverflow社区e it by the touch move method on the same center.

But I also need to toss/throw the arrow after doing some rotation with touch move. How can I toss the arrow?

http://www.edumobile.org/iphone/iphone-programming-tutorials/how-to-use-gestures-in-iphone-application/

You can refer to this for some basic events like swiping or touching.

For Physics engine, I suppose you can refer to this : http://code.google.com/p/chipmunk-physics/