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if the time is invcreasing the velocity increases too and depends on the distance to reach a high speed.
a high speed train travels south for 2.00 h for a distance of 454km. what is its average velocity?
I guess use a high speed camera Time it and measure the distance travelled.
The velocity. To convince yourself, consider the units of the slope. Slope = rise/run = vertical/horizontal= distance/time=units of velocity. Alternately, consider the meaning of the graph. Where the slope is high, the distance is changing fast over a small time - high velocity.
Distance does not affect time. At very high speeds - close to the speed of light - speed does make time go slower. This is the Lorentz time-dilation.