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A body is projected from the earth's surface with the intention of letting it escape...

Physics
JAMB 1995
A body is projected from the earth's surface with the intention of letting it escape from the earth's gravitational field. What is the minimum escape velocity of the body? [Earth's radius = 6.4 x 103km, g = 10ms-2]
  • A. 14 kms-1
  • B. 13 kms-1
  • C. 12 kms-1
  • D. 11 kms-1
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Correct Answer: Option D
Explanation
Velocity = \(\sqrt2gR\)

= 2 x 6400 x 100 x 10

= 11 km-1
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