1.

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

Answer»

`mgR//2`
2mgR
mgR
#REF!

Solution :`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))}`


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