The rigid assembly which consists of light rods and two 1.2-kg spheres rotates freely about a vertical axis. The assembly is initially at rest and then a constant couple M = 2 N∙ m is applied for 5 s. Determine the final angular velocity of the assembly. Treat the small spheres as particles.

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0.4 m 0.4 m M 1.2 kg 1.2 kg