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a 10kg block on a rough horizontal surface is attached to a light spring(spring constant= 3kN/m)....

a 10kg block on a rough horizontal surface is attached to a light spring(spring constant= 3kN/m). the block is pulled 20cm to the right from its equilibrium position and released from rest. the frictional coefficient between the block and surface is 0.4. what is the kinetic energy of the block as it passes through its equilibrium position?

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