binding energy

Question

Minimum energy to remove mass m from surface of Earth to infinity is:

RankGuru · Accepted Answer

This is equivalent to the **Binding Energy** of the object at the surface.
- Potential Energy at surface $U = -\frac{GMm}{R}$.
- Energy needed to reach $U=0$ (infinity) is $\Delta U = 0 - (-\frac{GMm}{R}) = \frac{GMm}{R}$.
- This refers to the energy required from rest; if already in orbit, the value is different.

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