Grenade/explosive damage fading

[ruler501]

I was talking about a curve more like 100/(x+1)^2
It works just you don't have a set point for damage to end(I'd think when it drops <1 would work). It also drops off extremely quickly. With 1470/(x+1)^2 you get 1470 at 0 120 at 2.5 and 40 at 5
EDIT: Here's an image with some inverse curves added in. Inverse square should be closest to real life, but that shouldn't really matter.

EDIT2: added 1-x^2
EDIT3: Added a variety of functions
EDIT4: Removed some and added source
http://maxima-online.org/#?in=range%3A5%...max%5D)%3B