Question

1. a distance time graph is flat for 5 seconds. what is the object doing?
2. a velocity time graph shows a straight line rising upward. what does this me
3. a velocity time graph is flat at 6 m/s. is the object accelerating? explain
4. an acceleration time graph is above zero for 3 seconds. what is happening to ve
5. which graph would best show when an object changes direction? why

Explanation:

1. On a distance-time graph, a flat line means distance does not change over time, so the object's position is constant.
2. A rising straight line on a velocity-time graph means velocity increases at a steady rate over time, which is constant positive acceleration.
3. Acceleration is the change in velocity over time. A flat velocity-time graph means velocity is constant (no change), so acceleration is zero.
4. An acceleration-time graph above zero means the object has a positive, non-zero acceleration, so its velocity is increasing during that interval.
5. A velocity-time graph plots velocity (including direction, shown by positive/negative values). When velocity crosses from positive to negative (or vice versa), the object changes direction, which is clearly visible on this graph.

Answer:

1. The object is stationary (not moving).
2. This means the object is undergoing constant positive acceleration (its velocity is increasing at a steady rate).
3. No, the object is not accelerating. A flat line on a velocity-time graph means the object's velocity remains constant at 6 m/s, and acceleration is the rate of change of velocity, so acceleration is 0 m/s².
4. The object's velocity is increasing (it is accelerating positively) for those 3 seconds.
5. A velocity-time graph would best show when an object changes direction. This is because velocity includes direction (represented by positive or negative values on the graph); when the line crosses the time axis (velocity switches from positive to negative or negative to positive), the object has changed direction.