Final answer:
A speed graph represents how the speed of an object changes over time. A flat line on a speed graph indicates that the speed of the object is constant. An acceleration graph represents how the acceleration of an object changes over time. The slope of the line on an acceleration graph represents the rate of change of acceleration.
Step-by-step explanation:
A speed graph represents how the speed of an object changes over time. The x-axis of the graph represents time, and the y-axis represents speed. The graph will show a line that may be curved or straight. A flat line on a speed graph indicates that the speed of the object is constant, meaning it is not changing.
An acceleration graph represents how the acceleration of an object changes over time. The x-axis represents time, and the y-axis represents acceleration. The graph will show a line that may be curved or straight. The slope of the line on an acceleration graph represents the rate of change of acceleration.