Question

The amount of work done in lifting a body of mass 'm from the surface of the earth
to a height equal to twice the radius of the earth is​

Answer 1

Answer:

Use work-energy theorem, work done (W) = change in potential energy. hence above formula becomes, . Thus, the amount of work done in lifting a body the surface of the earth to a height 2R is (2/3)mgR.

Answer 2

Answer:

Work done =Uf−Ui

=−2R+RGMm−(−RGmm)=32RGmM=32mgR