We divide that by the mass, so 0.12 kilograms, that's the mass of a regulation baseball for the major leagues, and the velocity of the baseball is 42 meters per second. So, we can cross out our units doing our unit analysis.
我们用质量来除它,质量为0,12千克,这是大多数联赛规定的棒球质量,棒球的速度为42米每秒,所以,我们可以消去单位,来做单位分析。
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