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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.
The ball no matter downward or updward trajectory, must go past the observer height to count. Strictly greater than.
Just remember what you are tracking during the entire observation.
Ball drops and rebounds that are visible to a stationary observer at a certain height.