Answer
$K = 0$
Work Step by Step
We can use conservation of energy to find $K$ when $y = -20~cm$:
$K+U_g+U_e = 0$
$K = -U_g-U_e$
$K = -mgy-\frac{1}{2}ky^2$
$K = -(20~N)(-0.20~m)-\frac{1}{2}(200~N/m)(-0.20~m)^2$
$K = 4.0~J-4.0~J$
$K = 0$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
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
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