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A military band was marching on a street in the same direction as the normal...

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A military band was marching on a street in the same direction as the normal traffic flow A motorist was approching the band from behind in his car just at the moment when they were playing the musical note A frequency 440Hz in unison The same band performance was also simultaneously being broad live on the ratio from a stationary microphone which was situated on the sidewalk just ahead of the band The motorist noticed that the combination of the direct sound coming from the band ahead of the band brodcast produced discernible beats Timing the beats he counted 4 beats in 3seconds He noted from the speedmeter that his car was travelling at 18 kilometers per hour Calculate the speed in meters per seconds at which the band was marching assuming that the speed of sound on that day was 1 330ms It was a very cold day

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