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Workign with Boxes going down a belt

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Boxes are transported by a conveyor belt with a velocity v_0 to a fixed incline at A where they slide and eventually fall off at B. Knowing that u_k=0.40, determine the velocity of the conveyor belt if the boses leave the incline at B with a velocity of 2m/s.

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we will use the conservation of energy here,

the initial energy of the box E = Kinetic+ Potential

= (1/2)mv^2 + mgh

from the figure, h = 6*sin15 = 1.55

final enrgy = (1/2) m ...

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