A graph titled velocity versus time has horizontal axis time (seconds) and vertical axis velocity (meters per second). A line runs from 0 seconds 5 meters per second to 5 seconds 25 meters per second. What is the initial velocity of the object represented by the graph? m/s.

"Initial" means "as our story begins", or "when we arrive", or "when we start watching it", or "at the beginning of time".

You just told us that on the graph, the speed was 5 m/s at zero seconds.     So that's the initial speed.

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat