>The amount of energy required to move x amount of mass is a math problem If the energy isn't lost to friction then most of it can be recovered. Although I thi

>The amount of energy required to move x amount of mass is a math problem If the energy isn't lost to friction then most of it can be recovered. Although I think it's impractical, the Hyperloop concept is one way to reduce friction. Instead of increasing transport speeds beyond current air travel, it could be used at the same speeds but much lower energy cost.