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: 13a

Answer

Average speed=72.5mph

Work Step by Step

When finding average speed, distance is disregarded. All that matters is fast the object moves, and how long it moved for. In this case, the object moved at 2 different speeds for the same amount of time, so the average speed will be right in the middle of the two speed.---55+90=145 145$\div$2=72.5
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