A rough vertical board has an acceleration ' \( a \) ' so that a \( 2 \mathrm{~kg} \) block pres...

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A rough vertical board has an acceleration ' \( a \) ' so that a \( 2 \mathrm{~kg} \) block pressing against it does not fall. The coefficient of friction between the block and the board should be
(a) \( g / a \)
(b) \( g / a \)
(c) \( =g / a \)
(d) \( a / g \)
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