Out of the given options, the one with the correct formula for calculation of the velocity of a position time graph is:
(y2 - y1)/(x2 - x1)
In a position time graph, the displacement of an object is determined using the difference in the height of the graph, while the time taken for this displacement is given by the difference in the x-values, which represent time. The ratio of these changes is displacement divided by time, which is equivalent to velocity.
