Posted by djspidal on Monday, December 6, 2010 at 9:18pm.
The answer depends upon the elevation of the 6 meter loop, relative to the starting elevation. That is not clear from your decription.
In any case, use conservation of energy.
By the way, not all cars in a roller coaster "train" are at the same altitude most of the time. It is the CM elevation of the entire train that matters
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