A spring $($oriented horizontally, k $=40$ N$/$m$)$ is attached to the left side wall in a room whose floor is frictionless. A small, dense mass $($m $=0\mathrm{.}5$ kg$),$ at rest on the floor, is attached to the right side of the spring. The unelongated spring length is $0\mathrm{.}6$ m$.$ A person then begins to pull on the system to the right with an applied force of $20$ N$.$ This force is applied until the spring elongates by $0\mathrm{.}25$ m$.$ The force then instantly disappears. Find the speed of the block when the applied force vanishes$\mathrm{.}2\mathrm{.}9$ m$/$s$3\mathrm{.}9$ m$/$s$4\mathrm{.}9$ m$/$s$5\mathrm{.}9$ m$/$s$10.$Refer to the system in question #$9.$ What is the length of the spring when the system has its minimum spring length?$0\mathrm{.}4$ m$0\mathrm{.}3$ m$0\mathrm{.}2$ m$0\mathrm{.}1$ m