A) 67.2
B) 33.6
C) 16.8
D) 25.2
Correct Answer: A
Solution :
\[\frac{{{v}_{p}}}{{{v}_{e}}}=\sqrt{\frac{{{g}_{p}}}{{{g}_{e}}}\times \frac{{{R}_{p}}}{{{R}_{e}}}}=\sqrt{9\times 4}=6\]\ \[{{v}_{p}}=6\times {{v}_{e}}=67.2km/s\]
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