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A car is traveling to the left, which is the negative direction. The direction of travel...

A car is traveling to the left, which is the negative direction. The direction of travel remains the same throughout this problem. The car's initial speed is 29.1 m/s, and during a 3.98-second interval, it changes to a final speed of (a)36.8 m/s and (b)24.1 m/s. In each case, find the acceleration (magnitude and algebraic sign).

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