$($hor this problem, use the dimensions, etc from problem $1$ on the previous page$).$ The springs AB and BC haveStitfness kand unstretched lengths of $/2($that$\text{'}$s a lower case $"$L$").$ Determine the horizontal force Fapplied tothe cord attached at B so that the displacement ofB from the wall is the distance d$.($ANS: $158$ N$)$BWww$.$

A TO C $=6$m

d$=1\mathrm{.}5$m

k $=500$N$/$m