The gravitational force inside the Earth is given approximately by (GMm/R3)r = gr/R, where r is the distance from the center and R is the radius of the Earth; see Problem 6.P.95 for additional...

The gravitational force inside the Earth is given approximately by (GMm/R3)r = gr/R, where r is the distance from the center

and R is the radius of the Earth; see Problem 6.P.95 for additional discussion. Draw the potential energy as a function of r,

from r = 0 to very large r (>> R). Note that the potential energy curve must be continuous, with no breaks.