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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
What are you subtracting by? Setting the h to h*bounce gives you the new height and drop of the ball each iteration.
This is actually really smart and succinct too. Something even a basic coder can understand