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## Homework Statement

So the problem I have is calculating the gravity acceleration on the height of 12740km or 2 times the radial distance of Earth. The problem is relatively simple and I think that I have it right but the result doesn't match with the book.

## g_0=9,81 \frac {m}{s^2} ##

##R=6370km ##

## h=R=6370km ##

## Homework Equations

## g = g_0 \frac{R^2}{(R+h)^2} ##

## The Attempt at a Solution

Well given that I have everything except ## g ## I could have just put everything in and be done with it. I went with canceling out the symbols and got ## g = \frac {g_0}{2} ## This resulted in 4.905. When calculating everything the result was 2.4525. The result specified in the book is 1,09 m/s^2. I'm really confused :)