The gravitational force exerted by the planet Earth on a unit mass at a distance r from the center of the planet is F(r) = GMr R3 if r < R GM r2 if r ≥ R where M is the mass of Earth, R is its radius, and G is the gravitational constant. Is F a continuous function of r? Yes, F is a continuous function of r. No, F is not a continuous function of r