本题目来源于试卷: Typical Forces，类别为 美国物理杯赛(Physics Bowl)
[单选题]
95.34: A student pulls a wooden box along a rough o, p c8cxu1ca* h d *4s0dz zn1daorizontal floor at constant speed b s0n dd*zz1ad4y means of a force P as shown to the right. Which of the following must be true?
A. $ P$ > f and N < W.
B. $P$ > f and N = W.
C. $P $= f and N > W.
D. $P$ = f and N = W.
E. $P$ < f and N = W.
参考答案: A
本题详细解析:
暂无
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