A 10-kg block on a horizontal frictionless surface is attached to a light spring (force constant = 8000 N/m). The block is initially at rest at its

A 10-kg block on a horizontal frictionless surface is attached to a light spring (force constant = 8000 N/m). The block is initially at rest at its rest position when a force (magnitude P = 80 N) acting parallel to the surface is applied to the block, as shown. what is the potential energy stored in the spring when it is 13 cm from its equilibrium position?