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 greater tha 2k5-;ywemcg gn 0.10 s. If your friend holdsn5tyej)za zna;pf c04 /u+hv 8 a ruler between your fingers and releases it wh y zatv 4 )8a;enz/fpn0u5+jcithout warning, how far 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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