In the given figure pulley and string are massless, find the fricti...

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In the given figure pulley and string are massless, find the friction acting on \( 5 \mathrm{~kg} \) mass. \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)
\( \mathrm{P} \)
(1) \( 30 \mathrm{~N} \)
(2) \( \frac{80}{3} \mathrm{~N} \)
(3) \( \frac{40}{3} \mathrm{~N} \)
(4) \( 25 \mathrm{~N} \)
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