A body is projected from the earth's surface with the hope of letting it escape from the earth's gravitational field. What is the minimum escape velocity?
[Earth's radius \(=\) \(\left.6.4 \times 10^{3} km , g=10 ms ^{-2}\right]\)

A. \(11.3 kms ^{-1}\)  
B. \(13.3 kms ^{-1}\)
C. \(12.3 kms ^{-1}\)
D. \(14.3 kms ^{-1}\)

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Correct Answer: A