Hello, I am new to physics and am having trouble with this homework problem. I thought I understood it, but it told me I was wrong and I'm not quite sure why. Here is the motion diagram I was given in the homework for the problem: The question is: What is the horse's velocity during the first ten seconds of its gallop? Seems easy enough? I know v=Δx/Δt, and Δx= xf-xi, and Δt= tf-ti So, from that I am figuring that the x on the diagram starts at 700m. At 10 seconds, the displacement would be 500-700= -200. The time would be 10 seconds (since it's going from 0s to 10s). Then, the velocity would equal -20m/s. But, the program is telling me that I am incorrect. Am I just reading/interpreting something wrong here? I think I understand, generally, what I'm supposed to be doing? Thank you so much for any help on this!