backwards or upside down
no.
They can swim in any direction.
Generally you don't swim through solids.
no a shark can not swim without it's top fin
it depends on the shark you are asking about. Most sharks want to swim alone because they want food to themselves and they are very vain. Some sharks swim in groups though. Only to be tougher then 1 shark is. But most of the time, a shark will swim alone.
The bull shark.
The basking shark can swim up to 4-6 miles per hour. They generally do not swim fast unless they are hunting prey.
Answer to swim
it helps it swim
Shark and dolphins.
A killer shark can swim up to 40 miles per hour. This varies depending on how large the shark is, how old they are, and what specific type of shark it is.
A shark can swim hundreds of miles. Sharks have been known to migrate as far as one continent to another.
it can swim as fast as a jet