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A rod 1 m long is 10 cm^(2) in area for ...

A rod `1 m` long is `10 cm^(2)` in area for a portion of its length and `5 cm^(2)` in area for the remaining. The strain energy of this stepped bar is `40%` of that a bar `10 cm^(2)` in area and `1 m` long under the same maximum stress. What is the length of the portion `10 cm^(2)` in area.

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