The acceleration of gravity on Earth's surface is 9.8 m/s2. What is the acceleration of gravity at a height of 6,400 km above Earth's surface? (Hint: recall the 1/r2 dependence and note that Earth's radius is 6,400 km.)
A. 19.6 m/s2
B. 2.45 m/s2
C. 9.8 m/s2
D. 4.9 m/s2
Answer: B
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