If the 40-kg gear B is released from rest at θ = 0°, determine the angular velocity of the...

If the 40-kg gear B is released from rest at θ = 0°, determine the angular velocity of the 20-kg gear A at the instant θ = 90°. The radii of gyration of gears A and B about their respective centers of mass are kA = 125 mm and kB = 175 mm. The outer gear ring P is fixed.