Spring block system: A box with unknown mass is stretched on a horizontal, frictionless surface 20cm from equilibrium. T

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answerhappygod
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Spring block system: A box with unknown mass is stretched on a horizontal, frictionless surface 20cm from equilibrium. T

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Spring block system:
A box with unknown mass is stretched on a horizontal,
frictionless surface 20cm from equilibrium. The Spring mass is
light and the spring constant= 300N/m. The block is
released at 0s. What is the KINETIC ENERGY (J) of the system when
velocity of block is 1/3 of max value.
Answer in J and in the hundredth place.
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