The mechanical energy of air per unit mass due to wind can be calculated using the formula for kinetic energy:
\[
E = \frac{1}{2} v^2
\]
where \( v \) is the wind speed. Given that \( v = 10 \, \text{m/s} \):
\[
E = \frac{1}{2} (10 \, \text{m/s})^2 =
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