【2)Agolferridesinagolfcartatanaveragespeedof3.10m/sfor28.0s.Shethengetsoutofthecartandstartswalkingatanaveragespeedof1.30m/s.Forhowlong(inseconds)mustshewalkifheraveragespeedfortheentiretrip,ridingand

问题：【2)Agolferridesinagolfcartatanaveragespeedof3.10m/sfor28.0s.Shethengetsoutofthecartandstartswalkingatanaveragespeedof1.30m/s.Forhowlong(inseconds)mustshewalkifheraveragespeedfortheentiretrip,ridingandwalki】

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孙洪华的回答：

网友采纳　　一个高尔夫球手以3.10m/s的速度在高尔夫小车上行走了28.0秒,之后她下了车并以1.30m/s的速度继续步行前进.问她需要走多久(以秒表示)才能使她在车上和步行的总个路程的平均速度是1.80m/s?解:在小车上行走的距离s1=v...