In astrophysical calculations, the gravitational potential V V\,V at a distance r r\,r from a planet of mass M M\,M is defined by V=−GMr\displaystyle V = -\frac{GM}{r}V=−rGM. Which of the following represents the correct unit of gravitational potential expressed in SI base units?
m s−2\text{m s}^{-2}m s−2
m2s−2\text{m}^2 \text{s}^{-2}m2s−2
kg m2s−2\text{kg m}^2 \text{s}^{-2}kg m2s−2
kg m s−1\text{kg m s}^{-1}kg m s−1
