A block rests on a rough inclined plane making an angle of 30° 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 10N, the mass of the block (in kg) is
(take g = 10m/s2 )
(a) 2.0
(b) 4.0
(c) 1.6
(d) 2.5
