Collin Chegg.com Wiley PLUS x Vectors The Dot Product X C edugen.wileyplus.com A

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Collin Chegg.com Wiley PLUS x Vectors The Dot Product X C edugen.wileyplus.com Assignment Open Assignment ONEXTD FULL SCREEN PRINTER VERSION HBACK ASSIGNMENT RESOURCES Chapter 02, Problem 033 Homework 2 Fall A car traveling 58.6 km/h is 26.2 m from a barrier when the driver slams on the brakes. The car hits the barrier 1.88 s later. (a) What is the car's constant deceleration magnitude before 2015 impact? (b) How fast is the car traveling at impact? Chapter 02. Problem 022 SN Chapter 02 Problem (a) Number Units 025 Chapter 02 Problem b) Number Units 029 Chapter 02, Problem 033 Chapter 02 Problem 035 Chapter 02 Problem Question Attempts: 0 of 5 used SAVE FOR LATER SUBMIT ANSWER 049 x Chapter 02 Problem 054 SN Chapter 02 Problem 069 Copyright 2000-2015 by John Wiley & Sons, Inc. or related companies. All rights reserved. Chapter 02 Problem 088 Chapter 02 Problem 099 Chapter 02 Problem 090 Chapter 02 Problem 119 Chapter 03 Problem 009 Chapter 03 Problem Chapter 03 Problem License Agreement I Privacy Policy I 2000-2015 John Wiley Sons Inc. All Rights Reserved. A Division of John Wiley & Sons Inc. Version 4.16.1.7 2:31 PM 9/5/2015

Explanation / Answer

a)     Use equation

here Vi=58.6km/h = 16.28m/s , t= 1.88s ,   d= 26.2 m

d= Vi*t+1/2*a*t^2

26.2= 16.28*1.88+1/2*a*1.88^2     => a= -2.5 m/s^2

b) Use equation

Vf^2 = Vi^2 +2*a*d = 16.28^2 +2*-2.5*26.2     => Vf= 11.6 m/s

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