Question 161 of 210

A boy of mass $4kg$ is standing on a piece of wood having mass $5kg$. If the coefficient of friction between the wood and the floor is $0.5,$ the maximum force that the boy can exert on the rope so that the piece of wood does not move from its place is _______ $N$. (Round off to the Nearest Integer)
[Take $\left.g=10{ms}^{-2}\right]$

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Answer: 30

$N+T=90$
$T=\mu N=0.5(90-T)$
$1.5T=45$
$T=30N$