Question

the \boxed{} of a position-time graph represents an objects velocity.

Explanation:

In a position - time graph, the slope of the graph is calculated as the change in position (Δx) divided by the change in time (Δt), and by the definition of velocity ($v=\frac{\Delta x}{\Delta t}$), the slope of the position - time graph represents the velocity of the object.

Answer:

slope