Minimum force required to keep a block of mass \( 1 \mathrm{~kg} \) at rest against a rough vert...

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Minimum force required to keep a
block of mass \( 1 \mathrm{~kg} \) at rest against a rough
vertical wall is \( P \). If a force \( P / 2 \) is applied
then the acceleration of the block will be :
(Take \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) )
\( \begin{array}{ll}\text { (A) } 5 \mathrm{~m} / \mathrm{s}^{2} & \text { (B) } 2.5 \mathrm{~m} / \mathrm{s}^{2} \\ \text { (C) } 2 \mathrm{~m} / \mathrm{s}^{2} & \text { (D) } 0.9 \mathrm{~m} / \mathrm{s}^{2}\end{array} \)
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