Portable Tennis Ball Machine

Brendan B asked:


A tennis player places a 48 kg ball machine on a frictionless surface. The machine fires a 0.057 kg tennis ball horizontally with a velocity of 25 m/s toward the north. What is the final velocity of the machine?

m/s to the south

Holly

tyler asked:


I know someone who is rated a 4.5 and when I hit with him for practice I do pretty well. I also hit well with the ball machine.

HOWEVER, when I play a game against people my level (3.5) or worse, I totally choke. I can’t even return really weak serves. I lose 6-0 to people who I should be able to beat easily.

So why do I **** at playing the game when I do okay during practice or hitting with the ball machine?
I’m so frustrated about this I’m thinking about quitting altogether.

Heidi

Nina is here! asked:


well I’m really bad at tennis and I need some help..

When I hit the ball, it always pops in the air before it goes down. It never does that when I watch other people play. Occasionally it goes low over the net but not much. How do I make sure it doesn’t pop in the air? How do I make it go low over the net?

If you have any websites that help me please list them…

I asked my parents if I could get lessons but is there really a need for lessons? They think all you have to do is practice and stuff but how can I practice when I have no one to play with (or anyone patient enough to play with me)?

If I use a ball machine, would that help me? Is it really neccesary to get lessons?

David

Tom asked:


Does anyone know what this wrist assist or raquet bracket thing is like which helps keep your wrist in position? I used to be much better that I am now but I had a pretty bad injury and didn’t play for like 3 years and seem to have picked up loads of bad habits with my forehand. I’m pretty sure the take back loop isn’t consistent enough and I have been trying to use the ball machine to sort but doesn’t really seem to be working. Its really frustrating me. Cheers

Oscar

poiklo0 asked:


A tennis player places a 51 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.065 kg tennis ball horizontally with a velocity of 34.6 m/s toward the north. What is the final velocity of the machine?
m/s to the south

Rafael