A) 5.6 km/s
B) 11.2 km/s
C) 22.4 km/s
D) 44.8 km/s
E) 67.2 km/s
Correct Answer: C
Solution :
Escape velocity from earth \[({{v}_{e}})=\sqrt{\frac{2GM}{R}}\] \[\frac{v_{e}^{}}{{{v}_{e}}}=\sqrt{\frac{2G(2M)}{R/2}\times \frac{R}{2GM}}\] Or \[\frac{v_{e}^{}}{11.2}=2\] or \[\text{v}_{e}^{}=22.4\text{ }km/s\]
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