In the figure, pulleys are smooth and strings are massless, \( m_{1}=1 \mathrm{~kg} \) and \( m_...
In the figure, pulleys are smooth and strings are massless, \( m_{1}=1 \mathrm{~kg} \) and \( m_{2}=\frac{1}{3} \mathrm{~kg} \). To keep \( m_{3} \) at rest, mass \( m_{3} \) should be
(a) \( 1 \mathrm{~kg} \)
(b) \( \frac{2}{3} \mathrm{~kg} \)
(c) \( \frac{1}{4} \mathrm{~kg} \)
(d) \( 2 \mathrm{~kg} \)
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