2001 AMC 8 第 19 题
先试着解答 2001 AMC 8 第 19 题，然后核对你的答案与精心整理的解答，解答来自 LIVE by Po-Shen Loh。你也可以参加完整限时模拟考试、查看全部 2001 AMC 8 解答，或核对答案。
所有题目均经美国数学协会（MAA）官方合法授权使用。
19.
汽车 以恒定速度行驶了一段给定时间，如虚线所示。汽车 以两倍速度行驶相同距离。如果用实线表示汽车 的速度和时间，哪张图表示这种情况？
Car traveled at a constant speed for a given time. This is shown by the dashed line. Car traveled at twice the speed for the same distance. If Car ’s speed and time are shown as a solid line, which graph illustrates this?
小提示：
两倍速度意味着相同距离只需一半时间
Twice the speed means half the time for the same distance
大提示：
实线应更高且更短
The solid line should be higher and shorter
解答：
汽车 的速度是汽车 的两倍，所以它在速度轴上的高度应是汽车 的两倍。
因为汽车 以更快速度行驶与汽车 相同的距离，所以它用一半时间完成行程。
因此表示汽车 速度的线段长度是表示汽车 速度的线段长度的一半。
两条线都水平，因为速度恒定。查看给出的图，唯一满足条件的是图 D。
所以正确答案是 D。
Car travels at twice the speed of car so it is represented by a point that is twice as high on the speed axis as car
Since car travels at the same distance as car but at a faster speed, it takes half the time to complete the trip.
Therefore, the line representing car ’s speed is half the length of the line representing car ’s speed.
Both lines are horizontal because the speeds are constant. Examining the given graphs, the only one that meets these conditions is graph D .
Thus, D is the correct answer.
其他年份的第 19 题
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