The speed of a wagon increases from 2.5 meters per second to 9.0 meters per second in 3.0 seconds as it accelerates uniformly down a hill. What is the magnitude of the acceleration of the wagon during this 3.0-second interval?
3.8 m/s2
2.2 m/s2
3.0 m/s2
0.83 m/s2
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