A block rests on a rough inclined plane making an angle of $30^o$ with the horizontal. The coefficient of static friction between the block and the plane is $0.8.$ If the frictional force on the block is $10\, N$, the mass of the block (in $kg$) is : (taken $g = 10 \,m/s^2)$
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$m g \sin \theta=f_{s}$ (for body to be at rest)
$\Rightarrow m \times 10 \times \sin 30^{\circ}=10$
$\Rightarrow m \times 5=10 \Rightarrow m=2.0 k g$
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