A block of mass 5 \( 5 \mathrm{~kg}^{\prime} \) is placed on a rough P horizontal surface. A var...

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A block of mass 5 \( 5 \mathrm{~kg}^{\prime} \) is placed on a rough
P horizontal surface. A variable force of \( 5 \mathrm{t} \) Newton

W. acts on it horizontally. If block starts slipping at \( \mathrm{t}=4 \mathrm{sec} \) and its acceleration at \( \mathrm{t}=5 \mathrm{sec} \) is \( 2 \mathrm{~m} / \mathrm{s}^{2} \).
Find the value of \( 10\left(\mu_{s}-\mu_{\mathrm{k}}\right) \).
(1) 1
(2) 2
(3) 3
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