A rocket with mass 7.00×10³ kg is in a circular orbit of radius 7.10×10⁶ m around the earth. The rocket's engines fire for a period of time to increase that radius to 8.90×10⁶ m, with the orbit again circular. What is the change in the rocket's kinetic energy during this process?
1) Cannot be determined
2) Decreases
3) Increases
4) Remains the same
