英语翻译Lillian (mass 40.0 kg) standing on slippery ice catches

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英语翻译
Lillian (mass 40.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 2.0 m/s.What is the speed of Lilian and her dog after the catch?

莉莉安（40kg）在光滑的冰面上接住了她的正在以2m/s的速度行进的狗（15KG）.莉莉安在借助她的狗之后速度是多少?
40*0+15*2=X*(15+40)
X=0.55m/s

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