In the figure, at the free end of the light string, a force \( F \)...

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In the figure, at the free end of the light string, a force \( F \) is applied to keep the suspended mass of \( 18 \mathrm{~kg} \) at
W rest. Then the force exerted by the ceiling on the system (assume that the string segments are vertical and the pulleys are light and smooth) is: \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
(1) \( 60 \mathrm{~N} \)
(2) \( 120 \mathrm{~N} \)
(3) \( 180 \mathrm{~N} \)
(4) \( 240 \mathrm{~N} \)
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