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 195

Repeat the same operation with the following settings:
 Interpolate Attribute: Projectile.Position.Y
 To: game.InitialProjectileY
 Duration: 1
 Function: Linear
The Back to Position rule is shown in Figure 6-42.
Figure 6-42. Back to Position rule
Resetting Key Attributes
Next, you need to reset the HasBeenTouched attribute, make projectile visible,
and change the status of Change Projectile to false.
Drag and drop a Change Attribute behavior into the Back to Position rule and
change Projectile.HasBeenTouched to false.
Drag and drop a new rule into the Back to Position rule, name it ''attribute
reset,'' and add the following conditions to ''All:''
 ''Attribute'' ''Projectile.Position.X''
''=''''game.InitialProjectileX''
 ''Attribute'' ''Projectile.Position.Y'' ''=''
''game.InitialProjectileY''