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A car is accelerating while its horn is blowing. Just after the car passes a stationary person, the person hears a frequency of 978 Hz. 16.0 seconds later, the frequency heard by the person has decreased to 915 Hz. When the car is stationary, its horn emits a sound whose frequency is 1100 Hz. The speed of sound is 343 m/s. What is the acceleration of the car? Assume that the velocity of the car is always in the positive direction.

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