When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 360 N to hold it there. We pull the block to x = 13.0 cm and then release it. How much work does the spring do on the block when the block moves from xi=+6.0 cm to (a)x= +3.0 cm, (b)x=-3.0 cm, (c)x=-6.0 cm, and (d)x=-10.0 cm?