12m0c\dfrac{1}{\sqrt{2}} m_{0} c21m0c
12m0c\dfrac{1}{2} m_{0} c21m0c
m0c\mathrm{m}_{0} \mathrm{c}m0c
2 m0c2\ \mathrm{m}_{0} \mathrm{c}2 m0c