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]
00.39: If a boat can trav3gx11bq szl lcz:4 2lyel witluwl( p*g)vob,b( d+ 29hv yklh a speed of $v$ in still water, which of the following trips will take the least amount of time.
A. traveling a distance of $2d$ in still water
B. traveling a distance of $2d$ across (perpendicular to) the current in a stream
C. traveling a distance $d$ downstream and returning a distance $d$ upstream
D. traveling a distance $d$ upstream and returning a distance $d$ downstream
E. all of the above will take equal times
参考答案: A
本题详细解析:
暂无
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