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29 November, 11:49

Which object has the greatest inertia?

(1) a 15-kg mass traveling at 5.0 m/s

(2) a 10.-kg mass traveling at 10. m/s

(3) a 10.-kg mass traveling at 5.0 m/s

(4) a 5.0-kg mass traveling at 15 m/s

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  1. 29 November, 14:58
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    The correct answer is

    (1) a 15-kg mass traveling at 5.0 m/s

    In fact, the inertia of an object depends only on its mass. The inertia gives a measure of "how hard is to put an object in motion", or "how hard is to stop an object in motion": the greater the mass, the larger the inertia of the object. In this problem, we have 4 objects, and the object with greatest mass is the first one (15 kg), therefore this is also the object with greatest inertia.
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