At 2:15 pm a passenger looks over at the speedometer and notices that

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At 2:15 pm a passenger looks over at the speedometer and notices that they are going 55 miles per hour DUE WEST. at 2:37 pm this very passenger hears a siren and looks over the speedometer again; she notices that they are going 83 mph, DUE WEST. What was the magnitude of the average acceleration of the car at the time of the interval?

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