Self$-$Exercise Problem Similar to Example $14\mathrm{.}4$

$14\mathrm{.}4\mathrm{.}1$ The platform $P$ has negligible mass and is tied down so that the $0\mathrm{.}4-m-$long cords keep a $1-m-$long spring compressed $0\mathrm{.}6-m$ when nothing is on the platform. If a $2-kg$ block is released from rest $0\mathrm{.}6-m$ above the plate as shown, determine the maximum further compression of the spring to momentarily stop the downward motion of the block. $T_1=0,T_2=0,m=2log$

$n,f_{\text{i}\text{n}\text{a}\text{l}}=\frac{1}{21}c(0\mathrm{.}6+x{)}^2$