Aboy starts from point a and moves 5 units toward the east, then turns back and moves 3 units toward the west. what is the displacement in the position of the boy?

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 3.2 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 12.9-kg slen