' - - File: XVb:   Solve Boundary Value Problem (BVP) 
'  Given:  X"(t) - 2X(t) = -g
'  Let y = x'

g = 9.801

F{t,x,y} = y
G{t,x,y} = -g  + 2x

to = 0 : :xo = 0  :  tb = 5  : xb = 40 : n = 200
BVP[F, G, {to,xo,tb,xb,n}]



