Fundamentals of Physics Extended (10th Edition)

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

Chapter 5 - Force and Motion-I - Problems: 24e

Answer

F2 = (-60N) i

Work Step by Step

The box is 2kg. We are shown F1 is acting towards the right along the x axis and that it has a magnitude of 20N. In part a, we are told that ax = -20$m/s^2$. Since F = ma then the Force = 2kg * -20 $m/s^2$ = -40N. Since F1 is already 20N, then F2 must be -60N since F1 + F2 = -40N
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