A series of small packages are being moved by a thin conveyor belt that passes over a 300-...

A series of small packages are being moved by a thin conveyor belt that passes over a 300-mm-radkis idler pulley. The belt starts from rest at time t = 0 and its speed increases at a constant ratio of 150 mm/s2 .Knowing that the coefficient of static friction between the packages and the belt is 0.75, determine the time at which the first package slips.