A urifonr araular cisc nas a mass of 20 g ancd a radius, R- 20U0 mm. Itrozenes about an axis pass ng through its centre. Acorstar: torque of -> Nim

is applied about ths acis. Neglecting ary fristional effe:ts, if the cisc sta ts from rest, its enguler speed of retationafter 3 sis most nearly