This is called a Lob
No, it is not in play. That is called a "Let Ball", the server does not receive a penalty and reserves.
It is called a fault. When a ball goes out, you raise a finger to tell your opponent.
Try hitting a table tennis ball with your driver and see how far it goes, this should answer your question.
A net ball is on any shot that it goes in the net. A let ball is when you are serving and it hits the net but the ball goes in therefore re-serving.
When the ball goes into the net. After that it stops. The person that hit the ball into the net looses the point.
The history of the tennis ball goes back to the 15th century, and the individual who created it has been lost to time. For further information on tennis balls, visit the Wikipedia link, below.
you throw it at the gound. then it goes up. then it comes back down
Hit the ball with a tennis racket and make sure it goes over the net, now your a pro!