来自梁伟立的问题
英语翻译1thechangeinpositionofabodyrelativetoothersiscalledmechanicalmotion2thepointwithmassanobjectisreplacedbyiscalledamasspoint3whenwedescribethemotionofanobject,anyotherobjectchosenasareferenceiscal
英语翻译
1thechangeinpositionofabodyrelativetoothersiscalledmechanicalmotion
2thepointwithmassanobjectisreplacedbyiscalledamasspoint
3whenwedescribethemotionofanobject,anyotherobjectchosenasareferenceiscalledareferencesystem
4displacementisanobjectstotalchangeinpasition
5distancehasonlymagnitudewhiledisplacementhasbothmagnitudeanddrection
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2020-05-31 05:08