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A rocket leaves Earth at three times the escape speed. Its speed far from Earth is about?
A31.7 km/s
B33.6 km/s
C11.2 km/s
D22.4 km/s
Answer & Solution
Correct answer: A. 31.7 km/s
Energy conservation gives v squared = 9ve squared - ve squared = 8ve squared, so v = 2.83 x 11.2 = 31.7 km/s.
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