Physics

Problem

![](https://storage.googleapis.com/diraq-contents/question-bank/question-images/5660ff91a90f/2025_11_20_6c008e7ceab86f3b0891g-06.jpg) 25. A student pulls a wooden box along a rough horizontal floor at constant speed by means of a force

P

as shown to the right. Which of the following must be true? (A) P

>

f and

\mathrm{N}<\mathrm{W}

. (B)

\mathrm{P}>\mathrm{f}

and

\mathrm{N}=\mathrm{W}

. (C)

\mathrm{P}=\mathrm{f}

and

\mathrm{N}>\mathrm{W}

. (D)

\mathrm{P}=\mathrm{f}

and

\mathrm{N}=\mathrm{W}

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