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An ideal spring hangs from the ceiling. A 1.25 kg mass is
hung from the spring, stretching the spring a distance
d = 0.0865 m from its original length when it reaches
equilibrium. The mass is then lifted up a distance
L = 0.0325 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 =
d
Equilibrium position
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