The mass of the moon is $7.34\times {10}^{22}\text{Kg}$  and the radius is $1.74\times {10}^6\text{m}$ . The gravitational field strength at its surface is

$\text{r}=1.74\times {10}^6\text{m}$

$\text{G}=6.675\times {10}^{-11}{\text{Nm}}^{\text{2}}{\text{Kg}}^{-2}$

$I=\frac{\text{GM}}{{\text{r}}^{\text{2}}}=\frac{6.675\times {10}^{-11}\times 7.34\times {10}^{22}}{{\left(1.74\times {10}^6\right)}^2}$

$=\frac{48.9945\times {10}^{11}}{3.0276\times {10}^{12}}=16.18\times {10}^{-1}$

$=1.618\text{N/kg}$

$\text{=1}\text{.62N/kg}$