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From the defination of angular displacement θ = ωit +(1/2)αt2ωi = initial angular speed = 0 rad/secα = angular acceleration = 0.025rad/s2t = timeθ = 4.2 radThen 4.2 rad = 0 +(1/2)(0.025rad/s2)(t)2then time t = 18.333 sec Remember newton's S=ut+1/2at2well it's θ=ωit+1/2αt2substitute: 4.2=0+0.5*0.025t2t=√336=18.33s ...