$1$: Find the mass of a rock if it took $65$ pounds of force to start it moving $($uk$=0\mathrm{.}22,$ us$=0\mathrm{.}40).$ Use two sig figs and answer in slugs.

 $2$: A man is pushing a $110$lb crate across the floor $($uk$=0\mathrm{.}28,$ us$=0\mathrm{.}45)$ at a constant velocity. With what force is the man pushing the crate? Use two sig figs.