Use constant loop value and double division  in other formulas like f  =ma, e = mc2,  e =hf and avoid possible systematic error.
check updated version of link file :
https://www.dropbox.com/s/juga9lffxfqni54/moving%20to%20center.xlsm?dl=0
https://drive.google.com/file/d/0B03s-v1XHNIydzdBem5WTG1jWUE/view?usp=sharing
Observe energy formulas (other than static
energy) and interaction of particles or elements from
power of 4 and above ie  e^4, f^4
etc..,  especially where time is a factor as a
square in formulas in order to find a best suitable loop value constant  and  and
check property of constant . Following
is an example :- 
e = mc² , e= (a+b)  , e^4 = e^3(mc²)
e^4
= (e ^3)a+ (e^3)b  where  after process loop value  constant is either
 e^4 
+ (e ^3)a- (e^3)b  = 0     or
e^4  +(e ^3)b-(e^3)a  = 0    
or
e^4  -(e ^3)b +(e^3)a  = 0    
or
e^3(mc²)
- (e ^3)b +(e^3)a  = 0  etc...
a
formula may have more than one loop value constant when given in a given value
of power. 
https://www.dropbox.com/s/juga9lffxfqni54/moving%20to%20center.xlsm?dl=0
https://drive.google.com/file/d/0B03s-v1XHNIydzdBem5WTG1jWUE/view?usp=sharing