A bolt gun has a spring of spring constant [tex]k=18 \mathrm{~N} / \mathrm{m}[/tex] which is used to fire a bolt of mass [tex]m[/tex]. The bolt leaves the gun at a speed of [tex]v=4.1 \mathrm{~m} / \mathrm{s}[/tex] after the spring is compressed [tex]1 \mathrm{~cm}[/tex].
