A rough vertical board has an acceleration 'a' so that a 2kg block pressing against it does not fall. The coefficient of friction between the block and the board should be:
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a
> g/a
b
< g/a
c
= g/a
d
> a/g
answer is A.
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Detailed Solution
For block mg = f and N = maBut f≤μN, so mg≤μma⇒μ≥g/a