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An ideal spring hangs from the ceiling. A 2.15 kg mass is
hung from the spring, stretching the spring a distance
d = 0.0835 m from its original length when it reaches
equilibrium. The mass is then lifted up a distance
L = 0.0255 m from the equilibrium position and released.
What is the kinetic energy K of the mass at the instant it
passes back through the equilibrium position?
K =
J
d
Equilibrium position
www.
14
L
Co

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