本题目来源于试卷: Scientific Skills & Tools，类别为 IB物理学
[单选题]
An object starting from rest travels a distance $d$ after a time $t$. If $d=(20\pm 1)m$, and the time is measured as $t=(2.0\pm 0.4)s$. Which of the following gives the correct values of the fractional and absolute uncertainties of acceleration?
A. Fractional is 0.25 Absolute is $\pm2.5ms^{-2}$
B. Fractional is 0.30 Absolute is $\pm3.0ms^{-2}$
C. Fractional is 0.45 Absolute is $\pm4.5ms^{-2}$
D. Fractional is 1.4 Absolute is $\pm14ms^{-2}$
参考答案: C
本题详细解析:
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