The minimum value of mass m sp the whole system reqmins in equilibrium is
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from figure we have
12×l=( l/2×m) + (3l/2)×3
12l =lm/2 +9l/2
24l = lm +9l
24l = l(m+9)
24l/l =m+9
24=m+9
m=15 kg.
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