Moving an object is not smooth.. why?

With your equation [z# = 13.0+ms/10000.0] I just realise :

floating values , I'm surprised it return a float...

(1/10) => Integer
Print(1/10.0) => float
Print(1.0/10) => float

I beleived the only way to get float was [a# * b = c#]
( So "a" should always be a float ... ) it seems it's (a# Or b#)