The earth's gravitational field intensity at its surface is about
(G = 6.7 à— 10\(^{-11}\)Nm\(^2\)/kg\(^2\), mass of the earth is 6 à— 10\(^{24}\)kg, radius of the earth is 6.4 à— 10\(^6\)m, g on the earth = 9.8m/s\(^2\))

A. 6.7N/kg
B. 7.9N/kg
C. 8.0N/kg
D. 9.8N/kg  

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Correct Answer: D