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 at 5l*h,b. :pauygx(ac1xfoudg w8 i c-:, kp9sz the North Pole ,),tn(x:t 7ci yj ys)vnsk.ni. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip taks) kytn:ycv, 7j.i,tinn s()x es 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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