Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

Published by Pearson
ISBN 10: 0133942651
ISBN 13: 978-0-13394-265-1

Chapter 2 - Kinematics in One Dimension - Exercises and Problems: 66

Answer

The speed is 5.7 m/s just as the light turns green.

Work Step by Step

The car moves 20 meters in 1.0 second. Then, the car needs to travel 180 meters in 14 seconds. We can then find the speed after slowing for 14 seconds; $v_{ave}~t=x$ $\frac{v+v_0}{2}~t = x$ $v = \frac{2x}{t}-v_0$ $v = \frac{(2)(180~m)}{14~s}-20~m/s$ $v = 5.7~m/s$ The speed is 5.7 m/s just as the light turns green.
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