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In the fig. given below masses \( \mathrm{m} \) and \( \mathrm{m}^{\prime} \) are tied with a thread passing over a pulley, \( \mathrm{m} \) is on a frictionless horizontal surface. If acceleration due to gravity is \( g \),
\( \mathrm{P} \) the acceleration of \( m \) ' in this arrangement will be:
(1) \( g \)
(2) \( m^{\prime} g /\left(m+m^{\prime}\right) \)
(3) \( m g / m^{\prime} \)
(4) \( m g /\left(m-m^{\prime}\right) \)
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