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3. A car is traveling to the left, which is the negative direction. The directian of travel
remains the same throughout this problem. The car's initial speed is 27.0 m/s, and
during a 5.0-s interval, it changes to a final speed of (a) 29.0 m/s and (b) 23.0 m/s. In
each case, find the acceleration (magnitude and algebraic sign) and state whether or
not the car is decelerating.

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