A) > g/a
B) < g/a
C) = g/a
D) > a/g
Correct Answer: A
Solution :
For the limiting condition upward friction force between board and block will balance the weight of the block. i.e. \[\operatorname{F} > mg\] \[\Rightarrow \,\,\,\mu (R)>mg\] \[\Rightarrow \,\,\,\mu (ma)>mg\] \[\Rightarrow \,\,\,\mu \,\,>\,\,\frac{g}{a}\]You need to login to perform this action.
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