question_answer

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

Correct Answer: D

Solution :

Force,\[F=\mu R=\mu \,Mg\] Weight of block \[=\mu R=0.2\times 10=2N\] Hence, the correction option is [d].