The triangular plate is fixed at its base, and $A$ is given a horizontal displacement of $s^{\text{'}}=3mm$ Suppose that $L=700mm($Figure $1)$

Figure

$1$ of $1$

Determine the average normal strain $lo{n}_x$ along the $x$ axis.

Express your answer in millimeters per millimeter to three significant figures.

$lo{n}_x=$mm$/$mm$|$