Higher pinions = safer MMM's? Or no? Someone's lying....

[TexasSP]

Just wondering but does the force to slow something down at higher MPH compound like the power it requires at higher MPH.

ie: I know that if say 2HP will get you 40 MPH you will need much more than double to get you 80 MPH. This is factoring in aerodynamics, wind resistance, etcetera. I do not remember the equation but remember reading about this extensively a couple of years ago. So the question is if it takes x amount of force to stop a vehicle at 30 mph does it take 2(x) to stop it at 60 mph or is it more? It seems to me like it would.