A) 0.2
B) 2.57
C) 4.81
D) 0.39
Correct Answer: C
Solution :
Escape velocity \[{{v}_{e}}=\sqrt{\frac{2GM}{R}}\] \ \[\frac{{{v}_{e}}}{{{v}_{m}}}=\sqrt{\frac{{{M}_{e}}{{R}_{m}}}{{{M}_{m}}{{R}_{e}}}}=\sqrt{\frac{81}{3.5}}=4.81\]
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