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 

(1) 2 N

(2) 20 N

(3) 50 N

(4) 100 N

Concept Videos :-

#1-Forces & Types
#2-Common-Forces-in-Mechanics-Normal-Reaction
#3-Common-Forces-in-Mechanics-Tension

Concept Questions :-

Types of forces
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