4. You want to sketch the velocity of the horse as a function of time. You know that it's important to establish a coordinate system, but you can't agree on the origin, where x=0 is. Chris says, \"You need to set the left-most position to be the origin,\" but Pat says, \"You need to pick the point at t=0, so that would be the right-most point in this case.\" And then they get into an argument over what direction should be the positive direction. How do you resolve it