Hoe systern shown in Figure $2$ below is in equifibrium,

a$.$ Determive the spring force EF$,$ cabie ACE of the pilley system, steel cable $AB$ and mase or $D$

b$.$ Determine also the ninat length of spring it the originat length of spring is $0\mathrm{.}45m$

$(25$ marks$)$

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$200N$