A block rests on a rough inclined plane making an angle of $30 ^{\circ}$ with the horizontal. The coefficient of static friction between block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of block is $(g=10 m/s^2)$

Question

$$(a)\;2.0\;kg \quad (b)\;4.0\; kg \quad (c)\;1.6\; kg \quad (d)\;2.5\; kg$$