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**1. The problem statement, all variables and given/known data**

A 62kg satellite orbits the Earth with a radius of 3.3*10^7 m. A net external force acts on the satellite to an orbit of 7.7*10^6 m, what work must the external force do?

**2. Relevant equations**

W = integral of F with respect to d

**3. The attempt at a solution**

Integrate F which in this case is GMm/r^2 which becomes -GMm/r, then plug in the radii. However, the answer that I got was -2.46*10^9, which is incorrect.