Fundamentals of Physics Extended (10th Edition)

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

Chapter 8 - Potential Energy and Conservation of Energy - Problems - Page 212: 130j

Answer

$K = 0$

Work Step by Step

We can use conservation of energy to find $K$ when $y = -20~cm$: $K+U_g+U_e = 0$ $K = -U_g-U_e$ $K = -mgy-\frac{1}{2}ky^2$ $K = -(20~N)(-0.20~m)-\frac{1}{2}(200~N/m)(-0.20~m)^2$ $K = 4.0~J-4.0~J$ $K = 0$
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