3) A disk with moment of inertia I₁ = I rotates about a frictionless, vertical axle with angular speed w. A second disk with a moment of inertia I2 = 1/2, and initially not rotating, drops onto the first disk (see figure). Because of friction between between surfaces, the two eventually reach the same angular speed. Their angular speed is A) 3w/2 B) 2w C) w D) w/2 E) 2w/3 Before After