thx again. I guess I can apply this to all similar problems
I prefer to use , perform all the calculations and only at the end substitute the value because :
- it can be applied to any value of
- it allows to find possible mistakes : when I find , I know that this is a homogeneous equation since b is expressed in cm, V0 in cm^3 and aČ in cm. If I use the value of V0, I am losing this possibility.