Weight and g: At a given point above Earth's surface, the acceleration due to gravity is equal to 7.8 m/s2. What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A. 770 km
B. 970 km
C. 1500 km
D. 2000 km
E. 2400 km
Answer: A
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