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What minimum launch speed lets a body leave Earth for good?
AAbout 7.9 km/s
BAbout 9.8 km/s
CAbout 11.2 km/s
DAbout 15.0 km/s
Answer & Solution
Correct answer: C. About 11.2 km/s
Setting kinetic energy equal to the binding energy at Earth's surface gives roughly 11.2 km/s.
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