2. Batman (mass 85-kilograms) is swinging on a rope, travelling at 15-meters/second. At the bottom of his swing, Batman nabs the Joker (mass = 60-kilograms) who is standing outside of a bank waiting for their getaway car. As a result, Batman and the Joker are now traveling together on the rope. a. What was Batman's momentum before he nabbed the Joker? b. What is the momentum of the Batman-Joker combined on the rope? c. What is the velocity of the Batman-Joker combination on the rope? d. How much force would be required to stop the Batman-Joker combination in 0.5-seconds?