A satellite is in circular orbit around Earth at an altitude of three Earth radii above the surface.  If the satellite uses onboard retro rockets to cut its speed to one half, at what distance from Earth can it establish a new stable circular orbit?  Hint: vorbit =

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Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.