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Two masses $m_1$ and $m_2$ connected by light spring rests on horizontal plane. The coefficient of friction between the masses and surface is $\mu$. What minimum force has to be applied in horizontal direction to the mass $m_1$ in order to shift the mass $m_2$ $ (g= 10 m/s^2)$

$ a)\; F= \frac{m_1 \mu g}{2} \\ b)\; F=\bigg(m_1+\frac{m_2}{2}\bigg)\mu g \\ c)\; F= \frac{(m_1+m_2)}{2} \mu g \\ d) F=\bigg(\large\frac{m_1+m_2}{m_2}\bigg)\mu g $

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