Answer
$-2.1 m/s^{2}$
Work Step by Step
Change in velocity = $30-75 = -45 km/hr = -45\times \frac{1000m}{3600s}=-12.5 m/s$
Average Acceleration = $-\frac{12.5 m/s}{6 s}= -2.1 m/s^{2}$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 2 - Kinematics: Description of Motion - Learning Path Questions and Exercises - Exercises - Page 61: 27
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