---
title: "A child pushes horizontally on a box of mass m with constant speed v across a rough horizontal floor. The coefficient of friction between the box and the floor is µ. At what rate does the child do work on the box?"
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url: "https://nerd-notes.com/ubq/21966/"
date_modified: "2024-04-30T07:12:06+00:00"
---

# A child pushes horizontally on a box of mass m with constant speed v across a rough horizontal floor. The coefficient of friction between the box and the floor is µ. At what rate does the child do work on the box?

A child pushes horizontally on a box of mass *m* with constant speed *v* across a rough horizontal floor. The coefficient of friction between the box and the floor is *µ*. At what rate does the child do work on the box?

- **A.** \( \mu mgv \)
- **B.** \( \mu mg/v  \)
- **C.** \(  \mu mg/v^2\)
- **D.** \( mgv \)
- **E.** Can not be determined.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/21966/*