escape velocity

Question

Escape velocity from spherical planet (mass M radius R) is:

RankGuru · Accepted Answer

Escape velocity ($v_e$) is the minimum speed needed for an object to escape the gravitational influence of a planet.
- Using conservation of energy: Total energy at surface = Total energy at infinity ($0$).
$\frac{1}{2} m v_e^2 - \frac{GMm}{R} = 0$
$v_e = \sqrt{\frac{2GM}{R}}$
- For Earth, $v_e \approx 11.2 	ext{ km/s}$.

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More escape velocity Practice Questions

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