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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.
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That would mean the car should decrease its speed by 80 km/h, i.e. to 20 km/h.
HOWEVER, as stated in the description, the maximum speed decreasal brakes can handle is 10 km/h, so for your example the car will actually lose only 10 km/h, meaning its final speed will be 90 km/h.
yes it is
Yes, as I think.
Hint: think about what a real car would do.