A cube, whose mass is 0.720 kg, is attached to a spring with a force constant...

  

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A cube, whose mass is 0.720 kg, is attached to a spring with a force constant of 106 N/m. The cube rests upon a frictionless, horizontal surface (shown in the figure below). The cube is pulled to the right at a distance A = 0.120 m from its equilibrium position (the vertical dashed line) and held motionlessly. The cube is then released from rest. At that very instant, what is the magnitude of the cube's acceleration (in m/s)? A m A cube, whose mass is 0.720 kg, is attached to a spring with a force constant of 106 N/m. The cube rests upon a frictionless, horizontal surface (shown in the figure below). The cube is pulled to the right at a distance A = 0.120 m from its equilibrium position (the vertical dashed line) and held motionlessly. The cube is then released from rest. At that very instant, what is the magnitude of the cube's acceleration (in m/s)? A m