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Question

If g is the acceleration due to gravity on the earth's surface, the gain in the potential energy of an object of mass m raised from the surface of the earth to a height equal to the radius R of the earth is
  1. 12mgR
  2. 2mgR
  3. 14mgR
  4. mgR

A
2mgR
B
14mgR
C
mgR
D
12mgR
Solution
Verified by Toppr

Gain in potential energy
=(GMm2R)(GMmR)
=GMmRGMm2R
=GMm2R
=mgR22RAs,GM=gR2
=12mgR

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