Lag1989 task №5.35

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On a horizontal rectilinear section of the track, the railway car is decelerated and its speed changes uniformly from 54 km / h to 36 km / h during t = 2.5 s. Determine the force of inertia Fu, acting on a suitcase weighing m = 18kg, lying on the horizontal shelf of the car. At what minimum value of the coefficient of friction k between the suitcase and the shelf will the suitcase begin to slide on the shelf?

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