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While sitting in your car by the side of a country road, you see your...

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Physics

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While sitting in your car by the side of a country road, you see your friend, who happens to have an identical car with an identical horn, approaching you. You blow your horn, which has a frequency of 260 Hz; your friend begins to blow his horn as well, and you hear a beat frequency of 6.2 Hz. How fast is your friend approaching you?Express your answer to two significant figures and include the appropriate units.

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