4. Rotational motion and momentum: a. A ladybug sits halfway between the rotational axis and the outer edge of the turntable table. The ladybug has a tangential speed of - m's, what will be tangential speed of her friend who sits at the outer edge? (5 points) b. You lift the child by using your elbow joint (pivot point). If the child's mass is B kg and distance from child to elbow joint is 0.40 m, calculate the torque? (5 points) c. A ball slides with initial velocity - m/s on a frictionless surface and collides with another identical ball of mass at rest. The balls stick together after the collision. Calculate the final velocity of the balls? (6 points)