Learning Gravity, Basic Physics, and Camera Controls: An Angry Birds-like Game, Part I - Learn GameSalad for iOS: Game Development for iPhone, iPad, and HTML5 - page 197

Hit the Preview button to play with the projectile.
You can open the file CanonShowPartI-step5.gameproj located in the folder
Chapter6_Files.
Summary
Ready to throw any objects at targets? With your brand new slingshot you will
be in a position to improve your targeting skills.
In this chapter, you have learned how to:
 Build a slingshot system.
 Simulate an elastic element.
 Control the camera.
 Implement gravity.
 Use advanced camera settings.
 Manage a limited number of attempts.