A) \[11.2\,\,km/s\]
B) \[5.6\,\,km/s\]
C) \[22.4\,\,km/s\]
D) None
Correct Answer: C
Solution :
\[v=\sqrt{2gR}\] Þ \[\frac{{{v}_{p}}}{{{v}_{e}}}=\sqrt{\frac{{{g}_{p}}}{{{g}_{e}}}\times \frac{{{R}_{p}}}{{{R}_{e}}}}=\sqrt{1\times 4}=2\] Þ \[{{v}_{p}}=2\times {{v}_{e}}=2\times 11.2=22.4\ km/s\]
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