function from .wl produces no output [duplicate]

Question

I'm trying to learn to reuse functions. I have created a .wl file with the following content. As I understand the last line without semicolon is the function output. Should each function have it's own block of Begin[] and End[]?

BeginPackage["vectorFunctions`"]

Begin["`Private`"] (* Begin Private Context *) 

vectorDeriv::usage="
vectorDeriv[v_,bc_Integer]
";
(* The function works fine if declared in the notebook. *)
vectorDeriv[v_,bc_Integer] := 
(
vFFirstDer = D[v,{t}];
vFSecondDer = D[v, {t,2}];
vFFirstDerNorm = N[Norm[vFFirstDer] /. t -> bc];
vFSecondDerNorm = N[Norm[vFSecondDer] /. t -> bc];
{vFFirstDer, vFSecondDer, vFFirstDerNorm, vFSecondDerNorm}
)
End[] (* End Private Context *)
EndPackage[]

When I try to call the function from the notebook I get no output.

 (* the path is correct *)
In[39]:= Get["C:\\Program Files \
(x86)\\MyJournal\\Images\\Math_Physics_Library\\vectorFunctions.wl"]

Out[39]= "vectorFunctions`Private`"

In[40]:= vF = {Sin[2 t], E^(3 t), t^3 - 4 t};

In[41]:= vectorDeriv[{Sin[2 t], E^(3 t), -4 t + t^3}, 2]

Out[41]= vectorDeriv[{Sin[2 t], E^(3 t), -4 t + t^3}, 2]

Am I missing something with the Private vs Public scope? Should modules be kept in only Mathematica's running directory?