A body is projected from the earth’s surface with the intention of letting it escape…

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
Correct Answer: Option D
Explanation

Velocity = (sqrt2gR)
= 2 x 6400 x 100 x 10
= 11 km-1

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