Slope: The slope of a position vs. time graph indicates the object's velocity at any given point in time. A steeper slope means higher velocity, while a flatter slope suggests lower velocity.
Displacement refers to the change in an object's position from its initial point to its final point. On a position vs. time graph, it can be determined by calculating the area under the curve between two specific points.
Instantaneous velocity is the velocity of an object at any particular instant in time, which can be found by drawing tangent lines to different points on a position vs. time graph and determining their slopes.