Help please i have no idea what to do A rectangular slab of mass ms moves across

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Help please i have no idea what to do

A rectangular slab of mass ms moves across a series of rollers, each of which is initially at rest and equivalent to a uniform disk of mass mR. Since the length of the slab is slightly less than three times the distance b between two adjacent rollers, the slab leaves a roller just before it reaches another one. Each time a new roller enters into contact with the slab, slipping occurs between the roller and the slab for a short period of time (less than the time needed for the slab to move through the distance b). Denoting vo the velocity of the slab in the position shown, determine the velocity of the slab after it has moved (a) a distance b, (b) a distance nb.

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