The discussion revolves around interpreting a velocity graph and determining the nature of acceleration based on its characteristics. Participants are examining whether the acceleration is zero throughout the entire graph.
Some participants have confirmed the notion that the acceleration is zero, suggesting that the acceleration graph would be a straight line on the time-axis. However, there is ongoing clarification regarding the implications of instantaneous changes in velocity.
The original poster references specific points in time where velocity changes, indicating a need to consider the nature of these changes in relation to acceleration.
gerben said:yes, the velocity is constant all the time, it just changes instantaneously at t=3 and at t=6. If there were non-zero acceleration the velocity would change over time and you would see a slope (upwards or downwards) in a velocity versus time graph.