Question

a body of mass M is taken from the Earth surface to the height equal to the twice the radius R of the earth change in potential energy of the body will be:

Answer 1

potential energy of a body is mgh
MgR eq1
where M is the mass of the body and G is the acceleration produced due to gravity and has a radius of the earth

the new potential energy after lifting the body of mass M to a height double the radius of the earth would be
Mg2R eq2


change in potential energy will be the final potential energy minus initial potential energy
Mg2R-MgR
2