The man is walking with speed v1 = 1.20 m/s to the right when he trips over a small floor discontinuity. Estimate his angular velocity just after the impact. His mass is 77 kg with center-of-mass height h = 0.72 m, and his mass moment of inertia about the ankle joint O is 65 kg·m2, where all are properties of the portion of his body above O; i. e., both the mass and moment of inertia do not include the foot. The angular velocity is positive if counterclockwise, negative if clockwise.