A cube, whose mass is0.660kg, is attached to a spring with a force constant of136N/m. The cube rests upon a frictionless, horizontal surface (shown in the figure below).A cube labeledmis attached to the right end of a horizontal spring, and the left end of the spring is attached to a wall. The spring is stretched horizontally such that the cube is displaced by a distanceAto the right of its equilibrium position.The cube is pulled to the right a distanceA=0.140m from its equilibrium position (the vertical dashed line) 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? N

(b)At that very instant, what is the magnitude of the cube's acceleration (in m/s²)? m/s²

(c)In what direction does the acceleration vector point at the instant of release? The direction is not defined (i.e., the acceleration is zero). Away from the equilibrium position (i.e., to the right in the figure). Toward the equilibrium position (i.e., to the left in the figure). You cannot tell without more information.

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a The magnitude of the spring force acting upon the cube is given by F kx ... View the full answer