An ideal spring hangs from the ceiling. A $1\mathrm{.}65$ kg mass is hung from the spring, stretching the spring a distance $d=0\mathrm{.}0855m$ from its original length when it reaches equilibrium. The mass is then lifted up a distance $L=0\mathrm{.}0315m$ from the equilibrium position and released.

What is the kinetic energy $K$ of the mass at the instant it passes back through the equilibrium position?

$K=$