A $4\mathrm{.}500-$kg block rests on top of a $2-$kg block supported by$,$ but not attached to$,$ a spring of constant $\backslash (40\backslash$mathrm$\{$~N$\}/\backslash$mathrm$\{$m$\}\backslash ).$ The upper block is suddenly removed.

Problem $13\mathrm{.}026.$b $-$ Height reached by a block resting on a spring

Determine the maximum height reached by the $2-$kg block. $($Round the final answer to three decimal places.$)$

The maximum height reached by the $2-$kg block is m$.$