What is the escape speed from a planet of mass m and radius r if m = 3.2 × 1023 kg and r = 2.4 × 106 m?
A. 5.5 km/s
B. 4.2 km/s
C. 5.2 km/s
D. 4.8 km/s
E. 3.7 km/s
Answer: B
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