1. The problem statement, all variables and given/known data How much energy is required to launch a 200 kg satellite from the surface of the earth into a circular orbit with radius 8.0 * 10^6 m? G=6.67*10^-11 2. Relevant equations Ep= -GMm/r 3. The attempt at a solution I calculated the gravitational potential energy of the object on the earth, then I calculated the gravitational potential energy of the object in the circualr orbit and then I subtracted the two and apparently thats not the correct way to tackle the problem.