- For the steel wall:
- Initial velocity, \( v_i = 11.0 \, \mathrm{m/s} \)
- Final velocity, \( v_f = -8.9 \, \mathrm{m/s} \) (negative because it bounces back)
- For the glass window:
- Initial velocity, \( v_i = 11.0 \, \mathrm{m/s} \)
- Final velocity,
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