At a distance of 14000 km from some planet's center, the acceleration of gravity is 32 m/s2. What is the acceleration of gravity at a point 28000 km from the planet's center?

Newton's law of universal gravitation: Every particle in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distances between them. This force acts along the line joining the two particles.