4 knots
if you are travelling at anything over the speed limit you may be fined
It depends on the airline, and the class you are travelling and which area of the world you are travelling to/from.
Some vessels carry boats so there is no lower limit.
Make a speed limit for boats and do not let petrol boats on the lake?
There are many places you can look online for repossessed boats. You probably want to limit your search by your area, but an example is www.yachtauctions.com.
Only if your ball is travelling faster than the set speed limit
Relativity theory establishes a speed limit for objects travelling through space - but the expansion of the universe is the expansion of space. There is no speed limit for that expansion.
It depends on a number of factors. These include: If you are travelling in First/Business/Economy. What your frequent flyer status is. Where you are travelling -domestic- to Asia, Europe, South America. If there is an embargo on the flight. There is more information at the related link.
There's no limit of age to go overseas, it all depends on the circumstances. Are you planning to go alone or with the family? If you're a minor, you obviously need consent from your parents. If travelling with your parents, there's no age limit.
The speed limit is exactly that - the speed limit. While a reasonable excess of speed might be overlooked when overtaking another vehicle, there is no guarantee. You can be pulled over and cited for speeding, still.
In a car, via Interstate 5, and travelling at the legal speed limit, about 20 hours drive time.
Depends on the Speed you are travelling. If you follow the speed limit, you will able to complete it in 6 hours -15 min.