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Questions  

If g is the acceleration due to gravity on the earth’s surface, the change 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

a
mgR/2
b
2mgR
c
mgR
d
-mgR

detailed solution

Correct option is A

ug=−GM1M2R⇒uf−ui=−GMm2R−GMmRΔu=GMm2R=mgR2g=GMR2

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