1.

In matrix form, system equation is expressed as

A. r<sub>i</sub>v<sub>i</sub> = -f<sub>j</sub>
B. r<sub>i</sub>v<sub>i</sub> = -K<sub>j</sub>
C. r<sub>i</sub>v<sub>i</sub> = -G<sub>j</sub>
D. r<sub>i</sub>v<sub>i</sub> = -Z<sub>j</sub>
Answer» B. r<sub>i</sub>v<sub>i</sub> = -K<sub>j</sub>


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