The spheres A and B each weighing 4 lb, are welded to the light rods that are rigidly co...

The spheres A and B each weighing 4 lb, are welded to the light rods that are rigidly connected to a shaft as shown. If the shaft is subjected to a couple moment of m (4t² + 2) lb • ft, where t is in seconds, determine the speed of A and B when t = 3 s. The system starts from rest. Neglect the size of the spheres.