Two blocks of masses $m_1=5 \;kg$ and $m_2= 6\;kg$ are connected by a light string passing over a light friction less pulley as shown in fig. The mass $m_1$ is at rest on the inclined plane and mass $m_2$ hangs vertically . If the angle of incline $\theta =30^{\circ}$, What is the magnitude and direction of the force of friction on the $5\;kg$ block . Take $g= 10 ms^{-2}$

Question

$\begin{array}{1 1}35\;N\;up\;the\;plane\\35\;N\;down\;the\;plane\\85\;N\;up\;the\;plane\\85\;N\;down\;the\;plane\end{array} $