Mass of the earth is M and its radius is R. An object of mass m is placed on the surface of earth. Find the work done in lifting the object through a height \(\frac{R}{2}\) above the surface of earth.
1
\(\frac{{GMm}}{{2R}}\)
2
\(\frac{{GMm}}{{3R}}\)
3
\(\frac{{2{\rm{\;}}GMm}}{{3R}}\)
4
More than one of the above
5
None of the above