4kgm24 \mathrm{kgm}^{2}4kgm2
12kgm212 \mathrm{kgm}^{2}12kgm2
4kgm−24 \mathrm{kgm}^{-2}4kgm−2
12kgm−212 \mathrm{kgm}^{-2}12kgm−2
