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This problem is very simple, but I don't see what I am doing wrong.

"A positive-time graph for a particle moving along the x axis is shown in Figure P2.7 Determine the instantaneous velocity at t = 2.00 s by measuring the slope of the tangent line shown in the graph."

I understand that without seeing the actual graph, it might be a little annoying, but it's a graph with a parabola with a tangent line.

My immediate reaction was to simply pick two points on the graph, and find the slope. This seems to be incorrect and seems to be the average velocity. To find the instantaneous velocity, the book uses the end points of the tangent line.

How do I go about finding the instantaneous velocity?

Thank you.