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: 6


129.6 km/h

Work Step by Step

We first need to find the speed of the original record in km/h. The question states that the stretch was 200m long, so first we need to convert this distance into km. Since there are 1000m in a km, 200m is equivalent to 0.2km. Since Chris Huber traveled this distance in 6.509s, we also need to convert this into hours. Since there are 60 minute in an hour and 60 seconds in each minute, there are 3600 seconds in an hour. Therefore 6.509seconds = 6.509/3600 = 0.0018 hours. His speed was therefore 0.2km/0.0018hr = 110.6km/h Since the record was beaten by 19km/h, we need to add this to the 110.6km/h that set the original record. This gives us 110.6km/h + 19km/h = 129.6km/h
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