This question was on my last test, and I got it wrong. If anyone could help me understand how to get the answer, I would really appreciate it! A small metal ball with a mass of m = 91.7 g is attached to a string of length l = 1.57 m. It is held at an angle of q = 47.5° with respect to the vertical. The ball is then released. When the rope is vertical, the ball collides head- on and perfectly elastically with an identical ball originally at rest. This second ball flies off with a horizontal initial velocity from a height of h = 3.19 m, and then later it hits the ground. At what distance x will the ball land? I'm not even really too sure on how to approach it!