In message , "Dave Plowman (News)"
writes
In article ,
Doctor Drivel wrote:
Nonsense. Heavy trucks roll down hills and up the other side very well.

Yet another example to prove you can't even drive.

Trucks on a motorway run at a constant governed speed. If they haven't got
enough power, they slow down on hills. Hence crawler lanes. Any kinetic
energy can safely be ignored in practice.

When going down hill the brakes may be applied to prevent them exceeding
the governed speed so there is little excess KE to carry them forward.
--
hugh