Question

A body of mass m is situated at a distance 4 Rₑ above the earth’s surface, where Rₑ is the radius of earth. How much minimum energy be given to the body so that it may escape

Options :

  1. mg Rₑ

  2. 2mg Rₑ

  3. mgRₑ/5

  4. mgRₑ/16

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Answer :

mgRₑ/5

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