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 eacrth to height to the radius R of the earth is

Options

A. `mgR//2`
B. 2mgR
C. mgR
D. #REF!

Answer

A

Explanation

`u_(g)=-(GM_(1)M_(2))/(R)`
`rArr" "u_(f)-u_(i)=-(GMm)/(2R)=(GMm)/(R)`
`Deltau=(GMm)/(2R)=(GMm)/(R)" "{g=(GM)/(R^(2))}`