A data point on a graph that doesn't follow the pattern of the rest is called an "outlier." Outliers can indicate variability in the data, measurement errors, or novel phenomena that deviate from the expected trend. They can significantly affect statistical analyses and interpretations, so it's important to investigate their causes.
The lowest point below the rest position of a wave is called the trough. The highest point above the rest position is called the crest.
To determine the speed of a body from a distance-time graph when the body starts from rest, you can find the slope of the graph. The slope of a distance-time graph represents the speed of the body. A steeper slope indicates a higher speed, while a shallower slope indicates a lower speed.
As the body is at rest, its distance from some point is not changing, so the graph will be a straight line parallel to the time axis (including the possibility of being on the time axis).
the rest position, or where it stops
The point where the wave crosses the rest position is called the equilibrium or zero point. This is where the particles in the medium are at their average or resting position before being displaced by the wave.
An outlier
the slope of distance time graph gives us velocity but when the body is at rest it will be zero
The tip of a wave is called the crest. This is the highest point of the wave above the rest position.
When the slope of a velocity vs. time graph is zero, it indicates that the object is momentarily at rest. The object is not moving or changing its velocity at that specific point in time.
The "high point" in a wave is called the crest. It is the point on the wave where the amplitude is at its maximum, representing the highest point of the wave above the rest position.
from the point at rest the line will be curved and going diagonally upwards visual: http://www.gravitywarpdrive.com/General_Relativity_Images/Falling_Ball_Graph_Distance.gif