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# A $12-kg$ box is released from the top of an inclined that is $5.0\;m$ long and makes an angle of $40^{\circ}$ to the horizontal. A $60-N$ friction force impedes the motion of the box. How long will it take to reach the bottom of the incline ?

$\begin{array}{1 1}2.76\;s\\36\;s\\24\;s \\62\;s\end{array}$