A graph titled position versus time has a horizontal axis time (seconds) and a vertical axis position (meters). A straight line passes from 0 seconds, 0 meters to 5 seconds, 20 meters. Calculate the slope of the line on the graph using the formula: m = m = v subscript 2 - v subscript 1 over x subscript 2 minus x subscript 1. The slope of the line is___m/s.