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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= x_{f}-x_{i}, and Δt= t_{f}-t_{i}

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!

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# Velecity of a galloping horse

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