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Inertia

/ˌɪˈnɜrʃə/
B2
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(noun) The property of a body that resists any change to its uniform motion; equivalent to its mass.

Inertia is an important governing law.
Never underestimate the power of inertia.
CEFR Practice Quiz
The car continued to roll uphill for a short distance due to its own mechanical ____.

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