9)^2 + 7 \times (0.15)^2 \]
\[ I_{\text{axle}} = \frac{1}{3} \times 7 \times 0.81 + 7 \times 0.0225 \]
\[ I_{\text{axle}} = \frac{7}{3} \times 0.81 + 7 \times 0.0225 \]
\[ I_{\text{axle}} = 1.4 + 0.1575 \]
\[ I_{\text{axle}} = 1.5575 \, \text{kg m}^2 \]
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