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The rear side of a truck is open ad a bo...

The rear side of a truck is open ad a box of mass 20 kg is placed on the truck 4 m away from the open rnd `mu=0.15` and `g=10 m//s^(2)` The truck starts rest with an acceleeration of `2 m//s^(2)` on a straight r9oad .The box will fall off the truck when it is at a distance from the staring point equal to (4x) meter fond value of x.

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