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Q: A car is moving towards a high cliff. The car driver blows a horn of frequency f. The reflected sound heard by the driver has frequency 2f. If v be the velocity of sound, the velocity of the car, in the same velocity units, will be

Q: A car is moving towards a high cliff. The car driver blows a horn of frequency f. The reflected sound heard by the driver has frequency 2f. If v be the velocity of sound, the velocity of the car, in the same velocity units, will be

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