A rough vertical boards has an acceleration 'a' so that a \( 2 \mat...

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A rough vertical boards has an acceleration 'a' so that a \( 2 \mathrm{~kg} \) block pressing against it does not fall. The
\( \mathrm{P} \) coefficient of friction between the block and the

W board should be
(1) \( g / a \)
(2) \( g / a \)
(3) \( =g / a \)
(4) \( a / g \)
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