Kids Riddles

Question: You're in a room with no doors or windows. Just a mirror and a table.

How do you get out?

Question: Two men play five sets of tennis together and each win three sets.

How is this possible?

Question: There's a B in my hand. So what's in my eye?

Question: what brings you down but never up

Question: I'm fat and I'm round and I cause much joy, I'm often a dogs favorite toy. What am I?