Why we can get R^2 common?


It’s nothing to take that personally it’s a new formula derived from it. So that GM/R² can be converted to g.
Now you can just use this simple formula to find and just by using g to be 9.8 or 10 and put value of height and radius.
This is called as smart study so pls learn this formulas as they can derive direct answer without going through hard calculations