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Speed is metaphysical

To say that a car is presently going 60mph is usually to say a counterfactual: one who says this means that if it did travel for an hour (even though it hasn't yet done so), then it would have traversed 60 miles. And this counterfactual goes beyond what has been experienced. For the measured speed in question is really the disposition to go 60 miles in an hour. But a disposition as such is beyond the reach of an empiricist. We simply don't sense "60mph": rather, we interpret something as having a disposition to traverse a certain distance. This interpretation, in going beyond experience, is just as metaphysical as causality, for like causality, disposition goes beyond experience in interpreting it.
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