2 ms·

Well, if you end up were you start, hills don't matter to physics.

• klyrs 7y ago
  If your "physics" don't include drag, rolling resistance, or conversion losses, I'm forced to agree. However, regenerative braking (like any other energy conversion process) is not lossless, and it turns out that low-speed, high torque acceleration is where they're least efficient [1]: required torque increases with the incline you're trying to accelerate up. And if you're staying at low speed, you'll be stuck in this low-efficiency regime, and you won't recoup much going back downhill. [1] http://large.stanford.edu/courses/2016/ph240/brown1/ http://large.stanford.edu/courses/2016/ph240/brown1/