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 great z qzh;i.s. s.oo./oqzer than 0.10 s. :vn e-z44pr vlpl,m mfh.c)c2-npy b1If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall befo-m)2ve c1vczm np l lyrn,bh.f4-p:4pre 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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