---
title: "A boy in a wheelchair (total mass \\( 47.0 \\) \\( \\text{kg} \\)) has speed \\( 1.40 \\) \\( \\text{m/s} \\) at the crest of a slope \\( 2.60 \\) \\( \\text{m} \\) high and \\( 12.4 \\) \\( \\text{m} \\) long. At the bottom of the slope his speed is \\( 6.20 \\) \\( \\text{m/s} \\). Assume air resistance and rolling resistance can be modeled as a constant friction force of \\( 41.0 \\) \\( \\text{N} \\). Find the work he did in pushing forward on his wheels during the downhill ride."
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url: "https://nerd-notes.com/ubq/90858/"
date_modified: "2026-08-18T02:39:47+00:00"
---

# A boy in a wheelchair (total mass \( 47.0 \) \( \text{kg} \)) has speed \( 1.40 \) \( \text{m/s} \) at the crest of a slope \( 2.60 \) \( \text{m} \) high and \( 12.4 \) \( \text{m} \) long. At the bottom of the slope his speed is \( 6.20 \) \( \text{m/s} \). Assume air resistance and rolling resistance can be modeled as a constant friction force of \( 41.0 \) \( \text{N} \). Find the work he did in pushing forward on his wheels during the downhill ride.

A boy in a wheelchair (total mass \( 47.0 \) \( \text{kg} \)) has speed \( 1.40 \) \( \text{m/s} \) at the crest of a slope \( 2.60 \) \( \text{m} \) high and \( 12.4 \) \( \text{m} \) long. At the bottom of the slope his speed is \( 6.20 \) \( \text{m/s} \). Assume air resistance and rolling resistance can be modeled as a constant friction force of \( 41.0 \) \( \text{N} \). Find the work he did in pushing forward on his wheels during the downhill ride.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/90858/*