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Dec 19, 2017 at 21:43 comment added cdunn "Accelerating to 20 km/h would be a violation of the conservation of energy." Actually it's not. You could do 20 km/h, but for a shorter time. Your not going to get more energy than you put in by regeneration, but you can use it up faster by going faster.
Dec 19, 2017 at 18:54 history answered juhist CC BY-SA 3.0