Changing Velocities: Acceleration or Deceleration?

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The discussion revolves around determining whether the given sets of velocities indicate acceleration or deceleration. The first example, transitioning from -0.9 m/s to +4 m/s, suggests an acceleration after a brief deceleration to zero. The second example, moving from +4 m/s to -4.5 m/s, indicates deceleration as the velocity shifts from positive to negative. Clarification is sought on whether the units should be in m/s or m/s², as the latter would change the interpretation of acceleration versus deceleration. Understanding the context of velocity changes is crucial for accurate classification.
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Homework Statement



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

Homework Equations



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.
 
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m/s (which is Metres per second) is the unit for Velocity not acceleration.

I don't know about everybody else, but personally I am not sure what your asking :confused:
 
lets say those were in m/sec^2, would they be deceleration, acceleration or a combination of both?
 

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