A spring is compressed by a 0.2 kg marble and held stationary. When released, the spring extends 4 cm (0.04 m) forcing the marble to a velocity of 0.68 m/s. What is the spring constant, k, of the spring?

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Chapter7: Work And Kinetic Energy
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A spring is compressed by a 0.2 kg marble and held stationary. When released, the spring extends 4 cm (0.04 m) forcing the marble to a velocity of 0.68 m/s. What is the spring constant, k, of the spring? 

Please show work- i NEED to see how it's being worked out. 

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