本题目来源于试卷: Physics Unit2: Kinematics One Dimensional Motion，类别为 通用国际物理
[单选题]
A polar bear starts atf;nt43;j vhq1/ld y ul 3 nm)8;w* rdv8 x.kn5mhakfl5g9tp grthe North Pole. It travels 1.0 km south, then 1.0 km east, npkk53l8; d t wr5fm)8xr ngmh.9v*ag then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?
A. 0 km/h
B. 0.09 km/h
C. 4.5 km/h
D. 5.3 km/h
参考答案: D
本题详细解析:
暂无
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