Physicshard · Past Paper
If the escape velocity on Earth is 11.2 km/s, what would it be on a planet with double the mass and double the radius of Earth?
A11.2 km/s
B22.4 km/s
C5.6 km/s
D15.8 km/s
✓ Correct Answer: A — 11.2 km/s
Escape velocity v = sqrt(2GM/R). If both M and R double, the ratio M/R remains the same.
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