A car of mass m drives at speed v towards a concrete wall. Its kinetic energy is ½ mv2, and all of that energy is dissipated when it hits the wall.
Now consider an identical car driving at speed 2v towards the same wall. Its kinetic energy is ½ m(2v)2 = ½ m4v2 = 2 mv2 — four times as much as the original car, since kinetic energy goes with the square of the velocity. I hope that up to this point, all this is uncontroversial.
As a long-time 2000 AD fan (I read it from Prog 1 and stayed with it for three or four years) I’ve been reading David Bishop and Karl Stock’s fascinating Thrill-Power Overload: 2000 AD — the first forty years [amazon.com, amazon.co.uk]. When I reached the section about the 1995 Judge Dredd film starring Sylvester “Rambo” Stallone, I was interested enough to watch it; and having seen that, I was interested to see the 2012 take starring Karl “Éomer” Urban.
So how do they measure up?