A child sits in a wagon with a pile of0.34-kg rocks. If she can throw each rock with a speed of 9.5 m>srelative to the ground, causing the wagon to move, how manyrocks must she throw per minute to maintain a constant averagespeed against a 3.4-N force of friction?

A child sits in a wagon with a pile of0.34-kg rocks. If she can throw each rock with a speed of 9.5 m>srelative to the ground, causing the wagon to move, how manyrocks must she throw per minute to maintain a constant averagespeed against a 3.4-N force of friction?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter9: Momentum And Its Conservation

Section: Chapter Questions

Problem 76A

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Question

A child sits in a wagon with a pile of
0.34-kg rocks. If she can throw each rock with a speed of 9.5 m>s
relative to the ground, causing the wagon to move, how many
rocks must she throw per minute to maintain a constant average
speed against a 3.4-N force of friction?

Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.

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