Trace the distance-time graph and the tangent at
Estimate the velocity at
Estimate the slope of the tangent.
Locate another time on the graph where the object has the same velocity as
. Use you graph to show how you know the velocities are equal.
Sketch various tangent lines to the graph of
. Keep sketching until you find one with the same slope as the tangent at .
Parallel lines have the same slope.