A block is attached to a spring which is attached to a stationary wall. When the block is pulled out to x = +5.0 cm, we must apply a force of magnitude 370 N to hold it there. We pull the block to x = 14.0 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? Fs=-kd Ws=1/2kxi2-1/2kxf2 Tried to find k by doing 370=-k(5)=-74 but then plugging this into: W=1/2kxi^2-1/2kxf^2 W=1/2k(6^2)-1/2k(3^2) W=18k-4.5k W=13.5k W=(13.5)(74)=999 This was definitely not the right answer. How do you go about finding k, or do you have to do something differently since the block was originally released from 14cm? Thank you!