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The rear side of a truck is open and a box of mass \( 20 \mathrm{~kg} \) is placed on the truck \( 4 \mathrm{~m} \) away from the open end \( \mu=0.15 \) and \( g=10 \mathrm{~m} / \mathrm{s}^{2} \). The truck starts from rest with an acceleration of \( 2 \mathrm{~m} / \mathrm{s}^{2} \) on a straight road. The box will fall off the truck when it is at a distance from the starting point equal to
(a) \( 4 \mathrm{~m} \)
(b) \( 8 \mathrm{~m} \)
(c) \( 16 \mathrm{~m} \)
(d) \( 32 \mathrm{~m} \)
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