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## Homework Statement

How much energy is required to move a 1 000-kg object

from the Earth’s surface to an altitude twice the Earth’s

radius?

## Homework Equations

U = - G Me m / r

## The Attempt at a Solution

I'm just using the above equation with 2r (twice the radius) and get 3.1 x 10e10 J, but the book says different...

Any help?? Thanks!