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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.
I'm agree with you, electronic333! If we have h=2, bounce=0.5, window=1 the answer will be 2. The first one than the ball falls and the second one after the bounce it rises to height 1.