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: 13b

Answer

68kmh

Work Step by Step

One can find the average speed in this equation by dividing the total distance by the elapsed time. For simplicity's sake, the total distance will be set equal to 100km (Although it would work for any distance). Each speed will travel half the distance: 50 miles.---Speed=miles$\div$hours 90km/h=50miles$\div$hours .556 hours 55km/h=50miles$\div$hours .909hours Total time= .909 +.556 Total time= 1.465 hours ------------------------------ 100miles$\div$ 1.465 hours=Average speed Average speed= 68.276kmh
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