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]
Human reaction time is usually grdj,e ;g5f/g myeater than 0.10 s. If your friefwpjedf:/ b /fg49 6n)u 5mkqand holds a ruler between your fingers and releases it without warning, how f9j e /upanf:bq /wk56dff 4g)mar can you expect the ruler to fall before you catch it?
A. at least 3.0 cm
B. at least 4.9 cm
C. at least 6.8 cm
D. at least 9.8 cm
参考答案: B
本题详细解析:
暂无
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