Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 2 - Motion Along a Straight Line - Problems - Page 34: 30a

Answer

2.51 seconds

Work Step by Step

We are given an acceleration of $-5.2m/s^2$, an initial velocity of $137km/h$ and an end velocity of $90km/h$ We first convert units: $137km/h=38.06m/s$ $90km/h=25m/s$ We plug these values into $v=v_{0}+at$ and solve for time: $t=(25m/s-38.06m/s)/(-5.2m/s^2)=2.51s$
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