I am doing make-up questions from my General Physics test. This is pretty easy stuff, and I thought I answered correctly, but according to my teacher's comments on my paper it seems like I'm missing something. 1. The problem statement, all variables and given/known data For the data provided, is the velocity for this object constant? How do you know? Displacement (cm): 15, 100, 190, 290, 380 Time (seconds): 0, 3, 6, 9, 12 2. Relevant equations 3. The attempt at a solution Just by looking at the data I would say it's not constant, but after graphing it, the trend curve is linear, so I wrote my answer as The teacher seemed to accept the answer as correct, but wanted more information because after my answer she wrote Is there any other way to explain the fact that the data is linear?