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A block of mass m oscillates on a horizontal spring. No resistive or driving forces are present. When the spring is stretched a distance Ao and released, the block with mass m has a kinetic energy KEo at the equilibrium position. If the mass of the block is doubled to 2m, and the spring is stretched as far to 3Ao, and released, what will the kinetic energy at the equilibrium position? A) 2KEo B) 3KEo C) 4KEo D) 9KEo E) 12KEo