Typical Forces (id: de6ea636a)

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 8rgz0oc :-mm/bl0(mx a pzhv4wooden box alon6;gbbc-pa+g qjvig+gcud ,fy;sa9):g a rough horizontal floor at constant speed by means of a force P as shown to the right. Which of the following must ga,u;bf;++sb gcg d9vg-: jyqi)cp6abe 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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