A block with mass mm $=0\mathrm{.}300$ kgkg is attached to one end of an ideal spring and moves on a horizontal frictionless surface. The other end of the spring is attached to a wall. When the block is at xx $=+0\mathrm{.}240$ mm$,$ its acceleration is axax $=-12\mathrm{.}0$ m$/$s$2$m$/$s$2$ and its velocity is vxvx $=+4\mathrm{.}00$ m$/$sm$/$s$.$