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Question

The ratio of the radius of the Earth to that of the moon is 10:1. The ratio of g on earth to the moon is 6. The ratio of the escape velocity from the earth’s surface to that from the moon is approximately 
  1. 8
  2. 2
  3. 4
  4. 10


Solution

The correct option is A 8
Given, 
rerm=10 and gegm=6
Escape velocity is given as,
     Ve=2gr
VeVm=2gere2gmrm
VeVm=gegm×rerm
VeVm=6×10
VeVm8

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