A cube, whose mass is 0.640 kg, is attached to a spring with a force constant of 142 N/m. The cube rests upon a frictionless, horizontal surface. The cube is pulled to the right a distance A= 0.130 m from its equilibrium position and held motionless. The cube is then released from rest. A. At the instant of release, what is the magnitude of the spring force (in N) acting upon the cube? B. At the very instant, what is the magnitude of the cubes acceleration ( in m/s^2)? C. In what direction does the acceleration vector point at the instant of release?

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