The 5-lb packages ride on the surface of the conveyor belt. If the belt starts from rest

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The 5-lb packages ride on the surface of the conveyor belt. If the belt starts from rest and its speed increases to 2 ft/s in 2s, determine the maximum angle θ so that none of the packages slip on the inclined surface AB of the belt. The coefficient of static friction between the belt and a package is μs = 0.3. At what angle ϕ do the packages first begin to slip off the surface of the belt after the belt is moving at its constant speed of 2 ft/s? Neglect the size of the packages.

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