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
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a
20 N
b
50 N
c
100 N
d
2 N
answer is D.
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Detailed Solution
Let R be the normal contact force by wall on the block. R=10N F=w and F=μR∴ μR=wor w=0.2×10=2N