a student makes measurements from which she calculates the speed of an objec

来源：百度知道 编辑：UC知道 时间：2024/06/04 11:47:36
A student makes measurements from which she calculates the speed of an object to be 127.66 m s-1. She estimates that her result is accurate to ± 2%. Which of the following gives her result expressed to the appropriate number of significant figures?
Answer is 128m/s Why???
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一个学生通过计算一个物体的速度测得了测量值

因为 accuracy 是 2%， 即精确到个位数，所以表示出来的速度应该也保留到各位，四舍五入得到128m/s.
同样的如果accuracy 是2.0%，则答案为127.7m/s.
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