Answer Happy

A block, whose mass is 0.640 kg, is attached to a spring with aforce constant of 110 N/m. The block rests upon a frictionless,horizontal surface (shown in the figure below). A block labeled mis attached to the right end of a horizontal spring, and the leftend of the spring is attached to a wall. The spring is stretchedhorizontally such that the block is displaced by a distance A tothe right of its equilibrium position. The block is pulled to theright a distance A = 0.120 m from its equilibrium position (thevertical dashed line) and held motionless. The block is thenreleased from rest. (a) At the instant of release, what is themagnitude of the spring force (in N) acting upon the block? N (b)At that very instant, what is the magnitude of the block'sacceleration (in m/s2)? m/s2 (c) In what direction does theacceleration vector point at the instant of release? Away from theequilibrium position (i.e., to the right in the figure). Toward theequilibrium position (i.e., to the left in the figure). Thedirection is not defined (i.e., the acceleration is zero). Youcannot tell without more information.