The feather's vertical position [tex]y[/tex] is determined by
[tex]y=\dfrac12g_{\text{moon}}t^2[/tex]
We take the feather's starting position to be the origin, and the downward direction to be positive. Then
[tex]y=\dfrac12\left(1.63\,\dfrac{\mathrm m}{\mathrm s^2}\right)\left(9.00\,\mathrm s\right)^2=66.0\,\mathrm m[/tex]
so the answer is D.
