A) 11.2 km/s
B) 22.4 km/s
C) 33.6 km/s
D) 42 km/s
Correct Answer: D
Solution :
Escape velocity, \[v=\sqrt{\frac{2G{{M}_{s}}}{{{R}_{s}}}}\] \[\therefore \] \[v=\sqrt{\frac{2\,(6.67\times {{10}^{-11}})(2\times {{10}^{30}})}{1.5\times {{10}^{11}}}}\] \[v=\sqrt{\frac{4\times 6.67\times {{10}^{8}}}{1.5}}\approx 42\,\,km/s\]
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