Two friends, Penelope (23.0 kg) and Zora (25.0 kg), are throwing snowballs at each other on a snowy day. Zora stands on a patch of icy, frozen ground where friction is negligible. Penelope stands on a section of ground that is not slippery at all. Suppose that Zora, initially at rest, throws a snowball (same mass and speed as de- scribed in part a) back at Penelope. What is Zora's speed after throwing the snowball