Tarzan (an 80-kg man) is standing at rest on a tree branch 20 meters above the ground. Jane (a 40-kg woman) is standing at ground level. Tarzan swings on a hanging vine from the tree and reaches ground level at the very bottom of his swing, where he grabs Jane and they continue the swing (upward again) together. How high off the ground do the two reach? (Hint: what kind of collision do the two have?
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