http://www.youtube.com/watch?v=LFNWeqXAD-M
This video shows a roller coaster with a very high acceleration. This roller coaster goes from 0 km/h to 100 km/h in 2.4 seconds! This is an example of extremely fast acceleration. This can also be an example of velocity since the roller coaster has no change of direction that we can see. However when this roller coaster does change direction, which it most likely will, the acceleration will change and it will not be in a state of velocity because velocity needs to be going in a specific direction.
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