A block, whose mass is 0.580 kg, is attached to a spring with a force constant of 142 N/m. The block rests upon a frictionless, horizontal surface (shown in the figure below). @ The block is pulled to the right a distance A = 0.110 m from its equilibrium position (the vertical dashed line) and held motionless. The block is then released from rest. (a) At the instant of release, what is the magnitude of the spring force (in N) acting upon the block? o (b) At that very instant, what is the magnitude of the block's acceleration (in m/s?)? e (c) In what direction does the acceleration vector point at the instant of release? O Away from the equilibrium position (i.e., to the right in the figure). O The direction is not defined (i.e., the acceleration is zero). Toward the equilibrium position (i.e., to the left in the figure). O You cannot tell without more information