Question

what is the height at which the value of g is same as depth of R2?

Answer 1

I’ll just show some graphs of gravity vs height so you can see how the ralation of gravity, depht and height portrayals:



The blue line represents the gravity.

We are distant to the densest part of the Earth, thus if we get a bit lower we should get a stronger gravity. Past this densest part, the lower we get the lower gets the gravity acceleration.

If we see this height from the graphic it’s actually not that different from sea level. In the case of being significantly higher, you wold need to go more than 3.500km below the surface to equal the gravity.