Planets are not uniform inside. normally, they are densest at the center and have decreasing density outward toward the surface. model a spherically symmetric planet, with the same radius as the earth, as having a density that decreases linearly with distance from the center. let the density be 1.20×104 kg/m3 at the center and 2100 kg/m3 at the surface. what is the acceleration due to gravity at the surface of this planet?

g= ? m/s^2