What does a horizontal line on a position-time graph indicate about the object?
1. The object is accelerating
2. The object remains still
3. The object has a constant, nonzero velocity
4. The object has a position of zero
2. The object remains still
A horizontal line on a position-time graph indicates that the object has a constant velocity. To understand why, we need to understand the relationship between position, time, velocity, and acceleration.
On a position-time graph, the vertical axis represents the position of the object, while the horizontal axis represents time. The slope of the line on the graph represents the object's velocity. If the slope is horizontal (i.e., it does not change), then the object's velocity does not change over time. This means that the object is moving at a constant velocity.
So, the correct answer is:
3. The object has a constant, nonzero velocity.