Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 7 - Kinetic Energy and Work - Problems - Page 171: 13a

Answer

170 Newtons

Work Step by Step

Initially the 85kg sled is moving at 37m/s and it comes to a stop while decelerating at 2.0 $m/s^2$. Since F = ma and the acceleration is 2 $m/s^2$ then the Force is 85 * -2 = -170N. Since the negative denotes only direction, the answer is 170N
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