The acceleration due to gravity, 9, varies with altitude above the surface of the earth, in a certain way. If you go down below the surface of the earth, g varies in a different way. It can be shown that g is given by GMr 9 when r R. Here R is the radius of the earth, M is the mass of the earth, G is the gravitational constant, and r is the distance to the center of the earth. Sketch a graph of g against r, and use it to answer the following questions: (a) Is g a continuous function of r? (b) Is g a differentiable function of r? (Be sure that you can explain your answers) Select a blank to input an answer Q13 SAVE HELP REPORT OLCE 9 DELL