k = 48 ⋅ 210000 N m m − 2 ⋅ 18260 c m 4 ( 5 , 00 m ) 3 = 147249 k N m − 1 _ _ {\displaystyle k={\cfrac {48\cdot 210000\,\mathrm {N} \mathrm {mm} ^{-2}\cdot 18260\,\mathrm {cm} ^{4}}{\left(5{,}00\,\mathrm {m} \right)^{3}}}={\underline {\underline {147249\,\mathrm {kN} \mathrm {m} ^{-1}}}}}
