Springs: An ideal spring has a spring constant $($force constant$)$ of $2500$ N$/$m$.$ is stretched $4,0$ cm$.$ How much work is required to str$1\mathrm{.}0$ J$3\mathrm{.}0$J$4\mathrm{.}0$ J$0\mathrm{.}00$ J$2\mathrm{.}0$ J