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130. The spring is relaxed at
y
= 0, so the elastic potential energy (Eq. 811) is
Uk
y
el
=
1
2
2
. The total energy is conserved, and is zero (determined by evaluating it at its
initial position). We note that
U
is the same as
Δ
U
in these manipulations. Thus, we have
0
=+
+
¡
=−
−
KU U
K U U
ge
where
U
g
=
mgy
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Energy, Potential Energy

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