A point J has geodetic coordinates: $(45\backslash$deg $2258,147\backslash$deg $4212,45\mathrm{.}226$m$),$ orthometric

height of $49\mathrm{.}621$m$,$ height anomaly of $4\mathrm{.}422$m$,$ and a measured gravity value of

$980\mathrm{.}641026$ Gal. Point K has the same coordinates as J but lies on the geoid. Ignoring the

contributions of the deflection of the vertical:

a$.$ What is the gravity disturbance at point J$?$

b$.$ What is the Free$-$Air gravity anomaly at point J$?$

c$.$ Using Brun$$s formula, what is the disturbing potential at point K$?$