A 50 kg block at A moves along the horizontal surface with negligible friction under the action of the constant 300 N force in the cable. The block is released from rest at A, with the spring to which it is attached extended an initial amount x1 = 0.3 m. The spring has a stiffness constant, K = 80 N/m. The kinetic energy of the block as it reaches position B is nearly equals to :
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