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Given mass of the moon is 1 over 81 of the mass of the earth and corresponding radius is 1 fourth  of the earth, If escape velocity on the earth surface is 11.2kms-1 the value of same on the surface of moon is.....kms-1

  1. 0.14
  2. 0.5
  3. 12.5
  4. 5

The correct answer is: 12.5

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