If coefficient of friction between all surfaces is \( 0.4 \), then find the minimum force \( F \...

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If coefficient of friction between all surfaces is \( 0.4 \), then find the minimum force \( F \) to have equilibrium of the system. (Take, \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) )
(a) \( 62.5 \mathrm{~N} \)
(b) \( 150 \mathrm{~N} \)
(c) \( 135 \mathrm{~N} \)
(d) \( 50 \mathrm{~N} \)
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