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Inertia is arguably the "stubbornness" of an object. It is the reluctance of a body to change its state of motion.
Have you ever tried to push a broken-down car? It is very hard to get it moving (Inertia). But once it IS moving, it is also hard to stop it (Inertia again!). The only thing that determines inertia is Mass. A Keke NAPEP has less inertia than a Trailer.
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