1. The problem statement, all variables and given/known data 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? 2. Relevant equations U = - G Me m / r 3. 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!