Differences like air resistance

Reference no: EM13675694

Clearly there will be differences like air resistance; I'm not interested in that. It seems like you're working against gravity when you're actually running in a way that you're not if you're on a treadmill, but on the other hand it seems like one must be able to take a piece of the treadmill's belt as an inertial reference point. What's going on here?

Reference no: EM13675694

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