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A 10-kg block on a rough horizontal surface is attached to a light spring (force
constant = 1.4 kN/m). The block is pulled 8.0 cm to the right from its equilibrium
position and released from rest. The frictional force between the block and surface
has a magnitude of 30 N. What is the kinetic energy of the block as it passes through
its equilibrium position?
06.9J
02.1 J
04.9 J
06.6 J
4.5 J

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