A 0.7-kg block on a horizontal frictionless surface is attached to an ideal spring whose force constant (spring constant) is 460 N/m. The block is pulled from its equilibrium position at x = 0.000 m to a position x = +0.085 m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis. When the position is x = -0.47 m, what is the acceleration of the block