本题目来源于试卷: Physics Unit4: Force Dynamics & Newton's Laws，类别为 通用国际物理
[单选题]
An object of mass m is hanglf h (ak8 397sn -9dpwu*gkhr3ok.nqving by a string from the ceiling of an elevat, zb5 1uqev(s)-ya da fdkl13mor. The ,klus1b dea- y )fda( 3m5qzv1elevator is moving up at constant speed. What is the tension in the string?
A. less than mg
B. exactly mg
C. greater than mg
D. cannot be determined without knowing the speed
参考答案: B
本题详细解析:
暂无
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