Answered: A 1100-kg car travels at 26 m/s and…

A 1100-kg car travels at 26 m/s and then quickly stops in 3.4 s to avoid an obstacle. What is the magnitude of the average force in kiloNewtons (kN) that stopped the car?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 8STP

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Question

A 1100-kg car travels at 26 m/s and then quickly stops in 3.4 s to avoid an obstacle. What is the magnitude of the average force in kiloNewtons (kN) that stopped the car?

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I = ∆PFavt = m∆vFav = mv - ut= (1100 kg)0 m/s-26m/s3.4 s= 8412 N= 8.412 kN≈ 8.4 kN

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