In a Broadway performance, a 84.5-kg actor swings down from a height of h = 3.50 m. a. What is his speed when he reaches the bottom of the arc? m/s b. At the bottom of his arc, he picks up his 55.0-kg costar in an inelastic collision. What is their speed after the collision? m/s c. What maximum height do they reach after their upward swing? m