. A block of mass 2.00 kg is attached to a horizontal spring with a force constant of 500 N/m. The spring is stretched 5.00 cm from its equilibrium position and released from rest. Use conservation of mechanical energy to determine the speed of the block as it returns to equilibrium
(a) if the surface is frictionless
(b) if the coefficient of kinetic friction between the block and the surface is 0.350
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