Quote:
Originally Posted by Ken G
It sounds like your question is, if I make two position measurements, can I not infer the velocity simply by noting the temporal separation between those measurements?
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I think the question may be simpler than that. For example, the measure the speed of a car, you have to know where it is. Otherwise, you don't know if you're measuing car A or car B. So the question is probably like this: if you want to measure the speed of a baseball, and point the camera in the wrong direction, you won't get a good reading. So how do you know how to point the "camera" if you don't know the location of the object you're measuring?