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Results tagged with energy-conservation
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user 85470
The law of conservation of energy, which states that the amount of energy in a system is constant. For questions about Earth's environment, see the climate-science tag instead.
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Why does mechanical energy have to equal zero to find escape velocity?
When a rocket is fired from Earth with a sudden impulse, its total energy is given by:
$$E_k \text{ (kinetic energy)} + E_p \text{ (potential energy)}=
\frac{1}{2}mv^2 - \frac{GMm}{r} = constant$$ The …