Question

 A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is- 

(a) 20 N

(b) 50 N

(c) 100 N

(d) 2 N

Answer 1

The correct option is d) 2N 

Frictional force balances the weight of the body

Frictional force f = μN = mg

f= 0.2 X 10 = 2N

Therefore, weight of the block mg= 2N