The rear side of a truck is open and a box of mass \( \mathrm{P} \)...

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The rear side of a truck is open and a box of mass
\( \mathrm{P} \) \( 40 \mathrm{~kg} \) is placed \( 5 \mathrm{~m} \) away from the open end. The coefficient of friction between the box and the
W. surface below it is 0.15 . The truck starts from rest with an acceleration of \( 2 \mathrm{~m} \mathrm{~s}^{-2} \) on a straight road. At what distance from the starting point does the box fall off the truck?
(a) \( 20 \mathrm{~m} \)
(b) \( 30 \mathrm{~m} \)
(c) \( 40 \mathrm{~m} \)
(d) \( 50 \mathrm{~m} \)
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