A group of engineers has landed on the moon, and they wish to determine the mass of some rocks. They have a spring scale calibrated to read pounds mass at a location where the acceleration of gravity is $9\mathrm{.}81$m$/$s$-2.$ One of the moon rocks gives a reading of $8\mathrm{.}5$on this scale. What is its mass? What is its weight on the moon? Take g$($moon$)=1\mathrm{.}622$m$/$ s$^-2$