Question: An unknown weight falls throught (10 mathrm{~mm}) on a collar rigidly attached to the lower end of a vertical bar, (3 mathrm{~m}) long and (6

An unknown weight falls throught $10 \mathrm{~mm}$ on a collar rigidly attached to the lower end of a vertical bar, $3 \mathrm{~m}$ long and $6 \mathrm{~cm}^{2}$ in section. If the maximum instantaneous extension is known to be $2 \mathrm{~mm}$, what is the corresponding stress and the value of unknown weight? take $E=200 \mathrm{GPa}$.

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