P $7\mathrm{.}8-8$ The circuit shown in Figure P $7\mathrm{.}8-8$ is at steady state when the switch opens at time $t=0.$ Determine $v_1(0-),v_1(0+),i_2(0-),i_2(0+),i_3(0-),i_3(0+),v_4(0-),$ and $v_4(0+).$