Physics Bowl by Topic 2: Kinematics - part I General Motion (id: 871cc51f2)

本题目来源于试卷: Physics Bowl by Topic 2: Kinematics - part I General Motion，类别为 美国物理杯赛(Physics Bowl)

[单选题]
97.18: A motorist travels 400 km ok((jy1xtmxu:ihn : 2w*-s;i/+ bzc dubd(q n at 80 km/h and 400 km at 100 km/h. What is the average speed of the motorn-(d+wi/z;b*sc q udb ist on this trip?

A. 84 km/h
B. 89 km/h
C. 90 km/h
D. 91 km/h
E. 95 km/h


参考答案:  B


本题详细解析: 暂无

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