Erica (21 kg) and Danny (32 kg) are bouncing on a trampoline. Just as Erica reaches the highest point of her bounce, Danny is moving upward past her at 3.0 m/s. At that instant, he grabs hold of her. What is their speed just after he grabs her? For this problem, ignore gravity. To solve this problem, first find Danny's and Erica's initial momentum, immediately before their collision.