1. The problem statement, all variables and given/known data I need to know if these set of velocities changing correspond to acceleration or deceleration? -0.9m/s - +4m/s +4m/s-4.5m/s 2. Relevant equations 3. The attempt at a solution I think that +4m/s-+5m/s is considered acceleration in the same direction -5m/s-7m/s is considered acceleration in the negative direction My chemistry told me that it the first example would be an example of a deceleration then an acceleration due to it becoming zero and then accelerating to +4m/sec and that the same idea applies to the second example.