Question

A block rests on a smooth inclined plane making an angle of ${30}^0$ 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

• A. 2
• B. 4
• C. 1.6
• D. 2.5

Answer 1

The correct option is A 2

$\because$ Block is at rest.
$f=mg\sin \theta$
$10=mg\sin \theta$
$\therefore m=2kg$