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Based on **Figure 1**, we get:

where:

In matrix form, the above can be re-written as:

Calculate * k_{1}*,

Based on **Figure 2**, we have:

and

The system stiffness matrix is:

Therefore, the problem becomes:

Which in turn results in the 3×3 system of equations:

Finally, we get:

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The rod of the picture is loaded with the force 2...

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