C-03-Q077mediumsingle_mcqThe expression for g at the earth's surface is—ag=GMRg=\frac{GM}{R}g=RGMbg=GMR2g=\frac{GM}{R^{2}}g=R2GMcg=GMR2g=GMR^{2}g=GMR2dg=R2GMg=\frac{R^{2}}{GM}g=GMR2