- Police car speed: \( 120.0 \, \text{km/h} = \frac{120.0 \times 1000}{3600} \, \text{m/s} = 33.33 \, \text{m/s} \)
- Observer car speed (opposite direction): \( 90.0 \, \text{km/h} = \frac{90.0 \times 1000}{3600} \, \text{m/s} = 25.0 \, \text{m/s} \)
- Observer
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