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A spring has natural length 30 cm,and a force of 50 Newtons(N) is required to extend it to 35 cm.How much work is required to extend it from 32 to 36 cm?

$\begin{array}{1 1}160\;N.cm\\170\;N.cm\\156\;N.cm\\150\;N.cm\end{array} $

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