Answer
$0.28\,ms^{-2}$
Work Step by Step
$a=\frac{\Delta v}{\Delta t}=\frac{55\,km/h-25\,km/h}{0.50\,min}=\frac{30\, km/h}{0.50\,min}$
$=\frac{\frac{30\times1000\,m}{3600\,s}}{30\,s}= 0.28\,ms^{-2}$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
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 39: 109a
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