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 33: 15d



Work Step by Step

Velocity is a function of t. We found in (a) that $v(t)=-12+6t$. This is a linear function with positive slope. At t=1, the velocity is negative ($-6m/s$), and it gets less negative, until the moment in time t=2s, when it becomes zero (after which it becomes positive and increases). The speed, being the MAGNITUDE of velocity, is thus, momentarily 6 m/s and approaching zero (until the moment t=2) after which it will increase from zero. Therefore, to answer the question, at t=2s, the speed is decreasing.
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