A rocket is fired vertically from the earth with an acceleration of $2g,$ where $g$ is the gravitational acceleration. On an inclined plane inside the rocket, making an angle $\theta$. With the horizontal , a point object of mass $m$ is kept. The minimum coefficient of friction $\mu_{min}$ between the mass and the inclined surface such that he mass does not move is :

Question

$\begin{array}{1 1}(1) \tan \theta \\ (2) \tan 2 \theta \\ (3) 3 \tan \theta \\ (4) 2 \tan \theta \end{array} $