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Re: This question
I've never really understood inertia.
If mass is a measure of inertia (more massive objects have more resistance to change in motion) then wouldn't zero inertia mean zero mass? If that's the case then perhaps the speed of something with no inertia would have to be like light—always c. But, then again, light does have some inertia, doesn't it? It imparts some energy to the thing which propels it or stops it.
~modest
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