Answer :
The weight of astronaut on the moon is,
[tex]W=mg[/tex]Plug in the known values,
[tex]\begin{gathered} W=(90kg)(1.62m/s^2)(\frac{1\text{ N}}{1kgm/s^2}) \\ =145.8\text{ N} \end{gathered}[/tex]Thus, the weight of astronaut on moon is 145.8 N.