Solve the following :


A body slipping on a rough horizontal plane moves with a deceleration of $4.0 \mathrm{~m} / \mathrm{s}^{2}$. What is the coefficient of kinetic friction between the block and the plane?


Vertical equilibrium


For horizontal; ${ }^{\text {Net }}={ }_{\text {ma }}$

$0-f f=m a$

$-\mu N=m a$

$-\mu m g=m a$

$-\mu g=\alpha$

$-\mu g=(-4)$

$\mu=0.4 \mathrm{~m} / \mathrm{s}^{2}$


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