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Supposed you are stopped for a traffic light, and an emergency response vehicle approaches you from behind. The siren produces a sound with a frequency

Supposed you are stopped for a traffic light, and an emergency response vehicle approaches you from behind. The siren produces a sound with a frequency of 955Hz. But the apparent (perceived)sound reaching your ears is 990Hz. The speed of sound in air 343 m/s . what is the speed of the moving vehicle (in m/s)?

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